premise: Iehiro Tokugawa (徳川家広 and 德川家廣 , Tokugawa Iehiro ) (born February 7, 1965) is an author, translator, and the heir of the main Tokugawa house. Members of his Tokugawa clan ruled Japan as Shoguns from 1603 to 1867. His great-great-grandfather was the famed Matsudaira Katamori of Aizu, and his maternal great-great-grandfather was Tokugawa Iesato, the sixteenth head of the Tokugawa clan.
hypothesis: Iehiro Tokugawa is currently 54 years old.
reason: If Iehiro Tokugawa was born on February 7, 1965, then that would mean that he is currently 54 years old.