When I retired I grew mine down to my shoulders while the remaining hair on top of my head continued to thin and finally all fell out. I rocked the bald guy ponytail for a few years, but went back to 1" or so all around this fall. Pretty much what I had in my working life minus the hair on top of my head.
I think I got my 2nd short cut back in January, and now I really need another. Don't really wanna go with the buzz, cause I'd look too much like my Dad. Don't really trust myself with anything other than a buzz with clippers, and no way I can do scissors. Wife won't cut it. Guess I'll just go back to hippiedom till this is over.