I learned to fly at 16, I was the youngest in the club back then. Now I'm 28 and still the youngest.
The few young guys that made it to the club now fly the big stuff and don't really fly in GA anymore.
This has always be my weak point in the club, very difficult to get through these old barnstromers. Also difficult to get in their club, e.g. I'm really keen on flying old airplanes, but most teachers I know on them are as old as the plane and don't want to teach me. Then who's to fly these things in 20 years?