How did men who were attentive/fit and socially/romantically desired a lot accept and gracefully age out of it as they got much older/less healthy (and much less desirable) and still find peace in living a good fun phase in life now a very real distant past?

Especially when they live in a collegetown where they have decade of fun but aged out of social scene that is void of people your own age single and comparable. Reminded daily passing old bars, dorms, frat houses that used to be your excitement and social/romantic life full of adventure but now dead (and can’t move to a bigger city where more compatible people live) and want sincere appearance that that phase is over and a new mature phase might not materialize?