A sexual attraction to a considerably older man, either by another male, or a female.
From the Greek words 'Geron' meaning 'old man' and 'philia' meaning 'love'.
The attraction is one based on a large age difference, beyond the norm, such as an eighteen year old being attracted to someone in their sixties, seventies, or even older.
Alphamegamia is the more specialized term, of having an attraction to an older man.
For those attracted to older woman, with the same wide age disparity, the specialized term is Anililagnia.