It really depends, like with any woman. But, if you want to be with her instead of just have sex (you're already leading on that this is more than a one time thing by inviting her and her son over), I'd suggest just being yourself lest you want it to end up in tradgedy later down the line.
_________________________________________
====== DOUBLE POST AUTO-MERGE ======
But, if she's into younger guys, unless she has one of those crazy fetishes, chances are she wants to feel young again...or likes the way younger guys work it. Though some of those vets like younger, mature guys.