Cooperstown was only 2 1/2 years ago for me. We went with a roster of twelve.
3 of the 12 are already done with baseball. Barely had the skills for 50/70. And, 60/90 ate them up quickly. The remaining 9 are still playing ball. My guess is that another 3 will be done soon. They are barely hanging in now, most likely. The remaining six will probably play in HS. Beyond that? Too early to tell.