Then why is this thread even called "DILF paradise" and not simply "men"? The term DILF doesn't refer to men who could simply be dads (even an 18 years old teen can biologically be a dad, after all), but to men over a certain age. 40+ seems reasonable to me and to others, this age limit seems to be quite accepted around here.
Also, I think you didn't see your dad in a sexual light when you were born...... or when you were a kid. DILF = dad I'd love to fuck, not simply "dad". Only adults should want to fuck other adults, so the minimum age range for a DILF should fall somewhere around 40 years old. The term DILF has the adult perspective incorporated into it.