What are you talking about?!?! That would be the best gym ever! Me, and a bunch of doods? Hell YEAH!!! I have like 80 year olds at my gym, try getting out of the locker room without being grossed out! I love old people and all, and I'm sure by the time I'm 80, I'll probably not care that I hang out in the locker room all naked talking to my other old wrinklie friends, but as I stand right now, I try to get in and out of that place as quickly as possible!!!
As for the workout routine, I usually do walk/run intervals on the treadmill for 30-45 minutes. Then, two days a week, I pump iron on the machines. I figured it would help me tone up better, especially my arms.
Some days, I go swimming, and other days, my friend is available for walking, and so he and I meet half way, and go for about a 4 mile walk.