Most Helpful Guy
No a dilf is a 'Daddy I'd like to Fu!!' so an older guy dating a younger girl isn't a dilf if he isn't hot.
So lets say an 20 yo dates a 40 yo and he's not conventionally attractive she just thinks he's funny he's not a dilf.
A 20 yo dating a 40 yo and all her friends all want to sleep with him because he's super sexy he's a dilf.
Same goes for a milf it's just a super hot person who's up in age.
Most Helpful Girl
Dilf can also be played between small age gap couples. It has more to do with the roles than the actual age.