An adultman or woman, usually in the early 20's, who are attracted to people significantly older. A gerantophile is sexually aroused by those who are about 20-30 years older.
Gerantophiles are budding young adults who are attracted to the elderly. Twenty-three year old Sally wants to marry Jim. Jim's 74. Sally is a gerantophile.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi