Japan's Prince Hisahito is the first male royal to reach adulthood in 40 years, highlighting the challenges facing the world's oldest monarchy.

Japan’s Prince Hisahito was formally recognized as an adult on Saturday in an elaborate ceremony steeped in imperial tradition. The only son of Crown Prince Akishino, Hisahito, 19, is second in line to the Chrysanthemum Throne.

Japan's Prince Hisahito has officially reached adulthood, becoming the first male royal to do so in 40 years. The 19-year-old, nephew of Emperor Naruhito, is second in line to the Chrysanthemum Throne. With no other male heirs after him, Japan faces renewed pressure to reconsider its 19th-century male-only succession rules.