Got my 0W 2 days before my 71st birthday. I plan to dive for another 15 years or so. Just finished my Nitrox this week because my Dr said it might be easier on my cardio system. The only problem I have is a back problem that limits what I can lift up the ladder. So I just make arrangements to remove unit and weights in the water and hand them up on the boat. I just make arrangements ahead of time.
Wise approach making arrangements ahead of time they will be able to tell you if it is possible to hand gear up. Occasionally the type of boat and dive conditions do not allow for that option
I get the bad back thing for sure. I have to watch body mechanics very carefully how I move and gear up etc. I must say I find that when my back is playing up a nice deep dive with some good stretching and flexing at depth seems to actually help my back.
I find it is important to watch how I "balance" my weight and be careful not to arch my back or curve it during the dive. I think mastering bouyancy control and a good BCD make a real difference. IMHO back inflate is much better than jacket when you have back issues. It doesn't take much effort to learn to inflate on the surface, roll over and swim on you back on the surface either. Just a few tips that have helped with my back issues not sure if it will help yours but I thought I would mention it.