beautybumble I'm also 72 and has been going to my gym for over 20 years.
It has a studio, a good size pool, sauna, cafe, lots of different classes, and all the usual weights, cycling, and treadmills and step equipment.
Classes include yoga, tai chi, pilates, senior dance and exercise classes as well as the hard suff for younger members. Above all, its very friendly, especially in the mornings.
I have long term aquintances there and I couldn't imagine life without it. changing rooms are large and comfy. It's part of the lower grade of Nuffield gyms. Once you pay the monthly rate everything is free.
People who come new get one free intro session, but it's not a bad idea just to have a course of 3 to 5 training sessions.
There are a large number of oldies there. One of the trainers is a physio and can help with specific problems. I go for same reasons as Gagajo - to keep mobile, flexible, tone everywhere as much as possible (I have CFS atm). as we age its use it or lose it.
Walking is lovely, but what about upper body and arms? Do you address pelvic floor problems (leaking wee or possibility of, as we age). Do we do twists, do we address core strength for back health?
but them, I've always loved exercise