At 76 , new hip , new knee , I can do most things just one heck of a lot slower . I shoveled 2 ft. of snow off a shed roof last week , probably a stupid thing to do at my age but it had to get done. It use to be you could hire a young person to do such a thing but no one wants to do that sort of thing anymore .
I gave up the shovel and now use a Roof Rake while standing on the ground.