I started losing hair in my 20's due to using a ton of gear, mainly Tren.
It fell out like crazy for about 5 years, there was hair all over the bathroom and shower.
Once i chilled out on the gear it stopped for the most part.
I have a receding hairline and i'd say i have about 85% of my hair still.
Lucky for me i have very thick and wavey hair, so it looks fine.
Both of my brothers are bald, my oldest brother has been shaving his head for 15 years.
So i have the gene for it, but it hasn't gone full retard on me yet.
At my age i don't care anymore, but in my 20's i was more vain and it bothered me alot. Took a bunch of different meds and used shampoos, nothing did anything.