A paedophile is someone who is attracted to little children. An elderphile is sort of similar apart from it is someone who is attracted to a senior citizen/ old fogey/ geezer/ elderly person.
If Timmy (who is 25) is sexually attracted to Gertrude (who is 108) he is being an elderphile.
A girl or boy who is attracted to nothing but older people in their thirties and above
jane: I can't get enough of jeffrey
Ben: isn't he fifty?
Jane: yea and?
Ben: Man you are such an elderphile, all your boyfriends are always over thirty