What do you call an older man dating a younger man?

Manthers Manthers are older men who pursue partners significantly younger than them.

Does age matter in a relationship when the man is older?

For some romantic couples, absolutely. They never think about their age as a factor in their compatibility. Modest differences in age, especially when men are older, tend not to preoccupy couples as they develop their relationships. For other couples, however, age is much more than a number.