It comes after Princess Aiko of Japan (pictured) carried out her first official royal engagement since coming of age as she joined her family for the traditional New Year's ceremony in Tokyo. Aiko, the only child of Emperor Naruhito, 61 and Empress Masako, 58, turned 20 in December, the age at which imperial family members officially begin their public life. It means she will now take on royal duties alongside senior family members.