RE: Does age have to do with what airplanes you fly?
If you're buying them then fly what you'd like.
Also, the "warbirds" of today are not what a lot of the older guys think of. A .91 size glow warbird or larger from 1980 with a heavy wing loading is a different animal from a dinky & light electric 12 oz warbird. The Hanger 9 P-51 is a trainer in a warbird paint pattern. Tip stalls and ground loops are less concern in the "semi-scale" sport warbirds that have some forgiveness built in.
I see you're doing the "big dogs" with 3W 75 engines & such. Good for you. You're lucky to have been introduced to it early.