I'm 54 yrs old and in relatively good health so I can't give you any advice on how to cope with limitations you are speaking of, but I can tell you that when I read posts on this forum about guys in their 60's, 70's and beyond still rideing bikes on roads and trails, I am truly inspired by the courage and determination it takes to continue on despite limitations brought on by age. I hope and pray that I can continue for a few more decades of rideing.