I'm 19 so I'm not quite in the range you are looking for, but I'll put my input out there. I enjoy the later System 11 games a lot. I play High Speed a lot too, but not any of the other early System 11s. While I enjoy playing EM pinball machines, I'm not big on wanting them. I have a 3 of them, but they don't get played often. Anything DMD that isn't Gottlieb I usually enjoy (with a very select few that break that rule). The late 70's Bally machines have a few I like, but overall not a big fan. The Mid 80's Ballys are also not a big favorite of mine, they just play like they are cheap.