I was in my mid-twenties when I noticed the hair collecting on the shower drain screen, and I would have to remove it for the tub to finish draining. Classic male pattern baldness that starts with a circle towards the rear of the head. It took more than 20 years to gradually get bigger, along with a receding hairline. At 62, the hair on the top is very, very sparse. I keep it trimmed to about a quarter inch.
I didn’t like going bald, but my attitude is that it’s just another physical characteristic that I can’t do anything about, so why worry about it, it’s just who I am.
On the other hand, my son went bald fast in his mid-twenties, and has been shaving his head all over ever since. It’s nice for him that there are a lot of men, with and without natural hair, who like to shave their heads.