Prince Hisahito is first Japanese male royal to reach adulthood in 40 years

Japan’s Prince Hisahito is the nephew of Emperor Naruhito (Kyodo News via AP)

Japan’s Prince Hisahito is celebrating his 19th birthday on Saturday, becoming the first male royal in the country to reach adulthood in 40 years.

Given the imperial family’s dwindling numbers, he could also be the last.