Meet The World's Royal Teenagers

Aiko, Princess Toshi of Japan is currently 19-years-old, and is the only child of Emperor Naruhito and Empress Masako of Japan. Since she is the only child, Japan has been in a decade-long debate about whether or not Japan should permit women to ascend to the throne. While it seemed like the resolution was slowly gaining support, talks were paused in 2006 when it was announced the Emperor's younger brother was expecting his third child. A boy was born, and he became the heir to the throne.