My gym membership is at the local University, I'm surrounded by hard-bodied 18-22 year old girls and a handful of faculty-aged folks like myself. Us 40+ folks are invisible to the younger ones so that's nice.

My rule...only use ONE locker - don't take up one locker for your coat/one for your clothes/and one for your bag. I don't enjoy having to share one with my SO for everything we have so you can spread out.