I think the most stupid saying I used to hear was act your age. Do what makes you feel good I say. I know in past generations people would do what society dictates what 60 70 or 80 yearolds do. So yeah 68 or 28 go sledding on your own because it's the right thing to do.
I remember my uncle went tobogganing with us kids until we moved to another state. I was probably 15 the last time we did that together and he was probably 58. I have recently wondered whether he kept it up on his own after that. I never thought to ask him while he was still alive.