Japan's Emperor Naruhito with Empress Masako, second right, their daughter Princess Aiko, right, Crown Prince Akishino, third left, Crown Princess Kiko, second left, and their daughter Princess Kako, left, as they appear on the balcony of the Imperial Palace to mark the emperor's 63th birthday in Tokyo Thursday, Feb. 23, 2023, in Tokyo. Eugene Hoshiko/Pool via REUTERS 

Japan's Emperor Naruhito accompanied with Empress Masako wave well-wishers as he appears on the balcony of the Imperial Palace to mark the emperor's 63th birthday in Tokyo Thursday, Feb. 23, 2023, in Tokyo. Eugene Hoshiko/Pool via REUTERS 

People holding flags enter the Imperial Palace to congratulate Emperor Naruhito of Japan on his birthday on February 23, 2023, Tokyo, Japan. People gathered to celebrate Naruhito's birthday at the Imperial Palace. Rodrigo Reyes Marin/Pool via REUTERS 

Emperor Naruhito of Japan delivers his message, expressing his wishes during his birthday celebration at the Imperial Palace on February 23, 2023, Tokyo, Japan. People gathered to celebrate Naruhito's birthday at the Imperial Palace. Rodrigo Reyes Marin/Pool via REUTERS 

Emperor Naruhito of Japan delivers his message, expressing his wishes during his birthday celebration at the Imperial Palace on February 23, 2023, Tokyo, Japan. People gathered to celebrate Naruhito's birthday at the Imperial Palace. Rodrigo Reyes Marin/Pool via REUTERS 

Emperor Naruhito of Japan delivers his message, expressing his wishes during his birthday celebration at the Imperial Palace on February 23, 2023, Tokyo, Japan. People gathered to celebrate Naruhito's birthday at the Imperial Palace. Rodrigo Reyes Marin/Pool via REUTERS 

Well-wishers cheer Japan's Emperor Naruhito as he appears on the balcony of the Imperial Palace to mark the emperor's 63rd birthday in Tokyo Thursday, Feb. 23, 2023, in Tokyo. Eugene Hoshiko/Pool via REUTERS 

(L to R) Emperor Naruhito of Japan and his wife Empress Masako greet visitors during his birthday celebration at the Imperial Palace on February 23, 2023, Tokyo, Japan. People gathered to celebrate Naruhito's birthday at the Imperial Palace. Rodrigo Reyes Marin/Pool via REUTERS 

Japan's Emperor Naruhito, accompanied by Empress Masako, waves to the well-wishers as he appears on the balcony of the Imperial Palace to mark the emperor's 63rd birthday in Tokyo Thursday, Feb. 23, 2023, in Tokyo. Eugene Hoshiko/Pool via REUTERS 

Japan's Emperor Naruhito, accompanied by Empress Masako and their daughter Princess Aiko, greets well-wishers as he appears on the balcony of the Imperial Palace to mark the emperor's 63rd birthday in Tokyo Thursday, Feb. 23, 2023, in Tokyo. Eugene Hoshiko/Pool via REUTERS 

Japan's Emperor Naruhito, accompanied by Empress Masako and their daughter Princess Aiko, waves towards the well-wishers as he appears on the balcony of the Imperial Palace to mark the emperor's 63rd birthday in Tokyo Thursday, Feb. 23, 2023, in Tokyo. Eugene Hoshiko/Pool via REUTERS 

Japan's Emperor Naruhito's daughter Princess Aiko waves to the well-wishers as she appears on the balcony of the Imperial Palace to mark the emperor's 63rd birthday in Tokyo Thursday, Feb. 23, 2023, in Tokyo. Eugene Hoshiko/Pool via REUTERS 

Japan's Emperor Naruhito accompanied with Empress Masako wave well-wishers as he appears on the balcony of the Imperial Palace to mark the emperor's 63th birthday in Tokyo Thursday, Feb. 23, 2023, in Tokyo. Eugene Hoshiko/Pool via REUTERS 

Japan's Emperor Naruhito waves well-wishers as he appears on the balcony of the Imperial Palace to mark the emperor's 63th birthday in Tokyo Thursday, Feb. 23, 2023, in Tokyo. Eugene Hoshiko/Pool via REUTERS 

People enter the Imperial Palace to congratulate Emperor Naruhito of Japan on his birthday on February 23, 2023, Tokyo, Japan. People gathered to celebrate Naruhito's birthday at the Imperial Palace. Rodrigo Reyes Marin/Pool via REUTERS 

People enter the Imperial Palace to congratulate Emperor Naruhito of Japan on his birthday on February 23, 2023, Tokyo, Japan. People gathered to celebrate Naruhito's birthday at the Imperial Palace. Rodrigo Reyes Marin/Pool via REUTERS 

Security guard monitors people during the Emperor of Japan Naruhito's birthday celebration at the Imperial Palace on February 23, 2023, Tokyo, Japan. People gathered to celebrate Naruhito's birthday at the Imperial Palace. Rodrigo Reyes Marin/Pool via REUTERS 

People enter the Imperial Palace to congratulate Emperor Naruhito of Japan on his birthday on February 23, 2023, Tokyo, Japan. People gathered to celebrate Naruhito's birthday at the Imperial Palace. Rodrigo Reyes Marin/Pool via REUTERS 

Well-wishers wait to see Japan's Emperor Naruhito as he appears on the balcony of the Imperial Palace to mark the emperor's 63rd birthday in Tokyo Thursday, Feb. 23, 2023, in Tokyo. Eugene Hoshiko/Pool via REUTERS 

Well-wishers wait to see Japan's Emperor Naruhito as he appears on the balcony of the Imperial Palace to mark the emperor's 63rd birthday in Tokyo Thursday, Feb. 23, 2023, in Tokyo. Eugene Hoshiko/Pool via REUTERS 

Well-wishers wait to see Japan's Emperor Naruhito as he appears on the balcony of the Imperial Palace to mark the emperor's 63rd birthday in Tokyo Thursday, Feb. 23, 2023, in Tokyo. Eugene Hoshiko/Pool via REUTERS 

(C to C-R) Emperor Naruhito of Japan and his wife Empress Masako greet visitors during his birthday celebration at the Imperial Palace on February 23, 2023, Tokyo, Japan. People gathered to celebrate Naruhito's birthday at the Imperial Palace. Rodrigo Reyes Marin/Pool via REUTERS 

(C to C-R) Emperor Naruhito of Japan and his wife Empress Masako greet visitors during his birthday celebration at the Imperial Palace on February 23, 2023, Tokyo, Japan. People gathered to celebrate Naruhito's birthday at the Imperial Palace. Rodrigo Reyes Marin/Pool via REUTERS 

(C to C-R) Emperor Naruhito of Japan and his wife Empress Masako greet visitors during his birthday celebration at the Imperial Palace on February 23, 2023, Tokyo, Japan. People gathered to celebrate Naruhito's birthday at the Imperial Palace. Rodrigo Reyes Marin/Pool via REUTERS 

Well-wishers are escorted to see the Japan's Emperor Naruhito at the Imperial Palace to mark the emperor's 63rd birthday in Tokyo Thursday, Feb. 23, 2023, in Tokyo. Eugene Hoshiko/Pool via REUTERS 

Well-wishers cheer as they see Japan's Emperor Naruhito appear on the balcony of the Imperial Palace to mark the emperor's 63rd birthday in Tokyo Thursday, Feb. 23, 2023, in Tokyo. Eugene Hoshiko/Pool via REUTERS 

Well-wishers are escorted to see Japan's Emperor Naruhito as he appears on the balcony of the Imperial Palace to mark the emperor's 63rd birthday in Tokyo Thursday, Feb. 23, 2023, in Tokyo. Eugene Hoshiko/Pool via REUTERS 

Japan's Emperor Naruhito delivers a speech as Empress Masako, second right, their daughter Princess Aiko, right, Crown Prince Akishino, third left, Crown Princess Kiko, second left, and their daughter Princess Kako, left, appear on the balcony of the Imperial Palace to mark the emperor's 63th birthday in Tokyo Thursday, Feb. 23, 2023, in Tokyo. Eugene Hoshiko/Pool via REUTERS 

Japan's Emperor Naruhito, accompanied by Empress Masako and their daughter Princess Aiko, delivers a speech to well-wishers as he appears on the balcony of the Imperial Palace to mark the emperor's 63th birthday in Tokyo Thursday, Feb. 23, 2023, in Tokyo. Eugene Hoshiko/Pool via REUTERS 

Japan's Emperor Naruhito, accompanied by Empress Masako and their daughter Princess Aiko, greets well-wishers as they appear on the balcony of the Imperial Palace to mark the emperor's 63th birthday in Tokyo Thursday, Feb. 23, 2023, in Tokyo. Eugene Hoshiko/Pool via REUTERS 

Japan's Emperor Naruhito, left, accompanied by Empress Masako, waves to well-wishers as he appears on the balcony of the Imperial Palace to mark the emperor's 63th birthday in Tokyo Thursday, Feb. 23, 2023, in Tokyo. Eugene Hoshiko/Pool via REUTERS 

Japan's Emperor Naruhito, left, accompanied by Empress Masako, waves to well-wishers as he appears on the balcony of the Imperial Palace to mark the emperor's 63th birthday in Tokyo Thursday, Feb. 23, 2023, in Tokyo. Eugene Hoshiko/Pool via REUTERS 

Japan's Emperor Naruhito waves to well-wishers as he appears on the balcony of the Imperial Palace to mark the emperor's 63th birthday in Tokyo Thursday, Feb. 23, 2023, in Tokyo. Eugene Hoshiko/Pool via REUTERS 

Japan's Emperor Naruhito, left, accompanied by Empress Masako, waves well-wishers as he appears on the balcony of the Imperial Palace to mark the emperor's 63th birthday in Tokyo Thursday, Feb. 23, 2023, in Tokyo. Eugene Hoshiko/Pool via REUTERS 

(L) Emperor Naruhito of Japan delivers his message, expressing his wishes during his birthday celebration, alongside Empress Masako, at the Imperial Palace on February 23, 2023, Tokyo, Japan. People gathered to celebrate Naruhito's birthday at the Imperial Palace. Rodrigo Reyes Marin/Pool via REUTERS 

(L to R) Emperor Naruhito of Japan and his wife Empress Masako greet visitors during his birthday celebration at the Imperial Palace on February 23, 2023, Tokyo, Japan. People gathered to celebrate Naruhito’s birthday at the Imperial Palace. Rodrigo Reyes Marin/Pool via REUTERS 

Japan's Emperor Naruhito greets people during his birthday celebration at the Imperial Palace in Tokyo, Japan, February 23, 2023.Rodrigo Reyes Marin/Pool via REUTERS 

Britain's Prime Minister Rishi Sunak reacts during a visit with Microsoft founder Bill Gates at Imperial College University, in London, Britain, February 15, 2023. Justin Tallis//Pool via REUTERS 

Britain's Prime Minister Rishi Sunak and Microsoft founder Bill Gates react as they speak during a visit of the Imperial College University,, in London, Britain, February 15, 2023. Justin Tallis//Pool via REUTERS 

Britain's Prime Minister Rishi Sunak reacts during a visit with Microsoft founder Bill Gates at Imperial College University, in London, Britain, February 15, 2023. Justin Tallis//Pool via REUTERS 

Britain's Prime Minister Rishi Sunak and Microsoft founder Bill Gates react as they speak during a visit of the Imperial College University,, in London, Britain, February 15, 2023. Justin Tallis//Pool via REUTERS 

Microsoft founder Bill Gates reacts during a visit with Britain's Prime Minister Rishi Sunak of the Imperial College University, in London, Britain, February 15, 2023. Justin Tallis//Pool via REUTERS 

Microsoft founder Bill Gates reacts during a visit with Britain's Prime Minister Rishi Sunak of the Imperial College University, in London, Britain, February 15, 2023. Justin Tallis//Pool via REUTERS 

Microsoft founder Bill Gates reacts during a visit with Britain's Prime Minister Rishi Sunak of the Imperial College University, in London, Britain, February 15, 2023. Justin Tallis//Pool via REUTERS 

Britain's Prime Minister Rishi Sunak and Microsoft founder Bill Gates speak with members of R-Leaf, parts of Crop Intellect, that is creating a technology aiming to turn air pollution into plant food, during a visit of the Imperial College University, in London, Britain, February 15, 2023. Justin Tallis//Pool via REUTERS 

Britain's Prime Minister Rishi Sunak and Microsoft founder Bill Gates speak with members of R-Leaf, parts of Crop Intellect, that is creating a technology aiming to turn air pollution into plant food, during a visit of the Imperial College University, in London, Britain, February 15, 2023. Justin Tallis//Pool via REUTERS 

Britain's Prime Minister Rishi Sunak and Microsoft founder Bill Gates speak with members of Econic, a startup developing technologies that enable the use of captured CO2 to make low-cost and sustainable plastics, during a visit of the Imperial College University, in London, Britain, February 15, 2023. Justin Tallis//Pool via REUTERS 

Britain's Prime Minister Rishi Sunak and Microsoft founder Bill Gates speak with members of Econic, a startup developing technologies that enable the use of captured CO2 to make low-cost and sustainable plastics, during a visit of the Imperial College University, in London, Britain, February 15, 2023. Justin Tallis//Pool via REUTERS 

Britain's Prime Minister Rishi Sunak and Microsoft founder Bill Gates speak with members of H2GO Power, a company aiming at developing technologies to change how hydrogen is stored and managed, during a visit of the Imperial College University, in London, Britain, February 15, 2023. Justin Tallis//Pool via REUTERS 

Britain's Prime Minister Rishi Sunak and Microsoft founder Bill Gates speak with members of H2GO Power, a company aiming at developing technologies to change how hydrogen is stored and managed, during a visit of the Imperial College University, in London, Britain, February 15, 2023. Justin Tallis//Pool via REUTERS 

Britain's Prime Minister Rishi Sunak and Microsoft founder Bill Gates speak with a member of H2GO Power, a company aiming at developing technologies to change how hydrogen is stored and managed, during a visit of the Imperial College University, in London, Britain, February 15, 2023. Justin Tallis//Pool via REUTERS 

Britain's Prime Minister Rishi Sunak and Microsoft founder Bill Gates react as they speak with members of H2GO Power, a company aiming at developing technologies to change how hydrogen is stored and managed, during a visit of the Imperial College University, in London, Britain, February 15, 2023. Justin Tallis//Pool via REUTERS 

Members of Imperial Guard march during the Imperial Guard New Year Review at the Imperial Palace Friday, Jan. 20, 2023, in Tokyo, Japan. Eugene Hoshiko/AP/Pool via REUTERS 

The special police unit members march on during the Imperial Guard New Year Review at the Imperial Palace Friday, Jan. 20, 2023, in Tokyo, Japan. Eugene Hoshiko/AP/Pool via REUTERS 

The special police unit members march on during the Imperial Guard New Year Review at the Imperial Palace Friday, Jan. 20, 2023, in Tokyo, Japan. Eugene Hoshiko/AP/Pool via REUTERS 

Mounted police march on during the Imperial Guard New Year Review at the Imperial Palace during the Imperial Guard New Year Review at the Imperial Palace Friday, Jan. 20, 2023, in Tokyo, Japan. Eugene Hoshiko/AP/Pool via REUTERS 

The special police unit members march on during the Imperial Guard New Year Review at the Imperial Palace Friday, Jan. 20, 2023, in Tokyo, Japan. Eugene Hoshiko/AP/Pool via REUTERS 

Members of police dog unit march during the Imperial Guard New Year Review at the Imperial Palace Friday, Jan. 20, 2023, in Tokyo, Japan. Eugene Hoshiko/AP/Pool via REUTERS 

Motorized police march on during the Imperial Guard New Year Review at the Imperial Palace during the Imperial Guard New Year Review at the Imperial Palace Friday, Jan. 20, 2023, in Tokyo, Japan. Eugene Hoshiko/AP/Pool via REUTERS 

The special police unit members march on during the Imperial Guard New Year Review at the Imperial Palace Friday, Jan. 20, 2023, in Tokyo, Japan. Eugene Hoshiko/AP/Pool via REUTERS