You never know. My dad has been a life long handyman but he also has MS. His body still works pretty damn well considering his age but that’s only until he gets too warm and his legs suddenly stop responding. He can still do most of the things he used to do just only in short stints. However, prolonged physical exertion leaves him unable to walk.

There are a lot of handicapped people who will look perfectly fine to the average person but may have a limited ability to remain fully physically abled for more that short periods of time.