Japan’s Prince Hisahito has turned 20 while facing growing attention as a future monarch Prince Hisahito, who is destined to become Japan's monarch instead of Emperor Naruhito's daughter Princess Aiko, has turned 20. Key points and original sources are listed below.

• Japan’s Prince Hisahito has turned 20 while facing growing attention as a future monarchS1

• Prince Hisahito, who is destined to become Japan's monarch instead of Emperor Naruhito's daughter Princess Aiko, has turned 20.S2