I myself just turned 77 and I never, ever rode 120 miles in a week in my life before making a return with recreational bicycling in 2023.

Even then I've only come close a couple of weeks in the years since, probably because I also ride on a trainer during the off-season months where I live.

I can't make a recommendation as to which bike you should acquire, my knowledge is scant compared to many (most?) others here.

All I can offer you is encouragement in overcoming what's kept you from bicycling since you had to take a break. You're an inspiration to the older cohort who still enjoys the benefits of cycling despite some of the compromises we have to make.