Japan’s beloved former Emperor Akihito marked his 91st birthday on Monday, as he continues to pursue his lifetime research into goby fish, care for his wife and pray for peace. Akihito, who abdicated in 2019 and handed over the Chrysanthemum throne to his son, Emperor Naruhito, now holds the title of Emperor Emeritus.

Akihito has since receded from official duties and enjoys his time quietly while caring for his 90-year-old wife, former Empress Michiko, who broke her leg bone in October and is still recovering, according to the Imperial Household Agency.