Was late getting to shovel my car out after an arugement with my mother about while my daughters 18 and 20 couldn't do it. One has CP and serious balance issues, plus a leg that has been put back together by surgery twice. The other has arthritis and when it flairs, it is very important that she does not put strain on her joints. When I finally get out there, she puts a rain coat over her bathrobe and comes out to "help."
In theory, yes, girls that age should be shoveling. It's more rant on her part that it isn't fair that I have to when they "ought" in a perfect world to be able to do it.
Next time, hand her the shovel.