RE: Does age have to do with what airplanes you fly?
It is not age but experience that is important. If you are careful, safe, and fly professionally (know and follow the rules) then I would fly with you any time. It sounds like you have more experience then a lot of others I have flown with but you still need to know the characteristics of the plane you will be flying.
P-51s fly differently than trainer planes for example. So be on your toes and go for it.
At the club I used to belong to there was a 12 yr old that few a Corsair. And he flew it with grace, and showed a lot of us that age does not matter. His father was there with him all the time and helped him but he flew it very well. Good luck!