Started thinning in my 20s, went full Prince William in my 30s so I just shaved it off. Bare clippers though, not with a razor.
There are a few different reasons for hair loss, it is a symptom of low testosterone sometimes as well though so that's probably where you got the impression. Most of the time it's a genetic predisposition towards conversion of a particular kind of testosterone and doesn't have anything to do with overall levels.
Try Rene Furterer. I use his shampoos, they're a bit pricey but really worth it. Your hair is going to fall, but this helps it last longer and keeps it stronger than the usual shampoos with chemicals in them.
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There is an easy way to prove this incorrect: Trans people. If low testosterone would lead to hair loss, starting HRT would cause Trans women to actually lose hair quicker; in reality however, the very opposite is the case: Going off Testosterone usually stops - or drastically slows down - hair loss for them.
Many years ago, never really been bothered about it, people act as if they're getting cancer or something when they lose their hair, cut your hair short and stop acting as if it's the end of the world.
There are several upsides with beeing bald, you don't have to spend time setting your hair in the morning, no expense to hair products, no more getting shampoo in your eye now and then, no bad hair days. etc. etc.
Biggest downside is if you live in a cold climate, I swear it's like walking around with your ass naked when it's -15c and you havent covered your top ><
As far as I know, the genetic hairloss is caused by excess of Dihidrotestosterone, or DHT, which is created from testosterone, so I guess the males with a higher testosterone % have more chances to got more DHT.
Anyway, I would really like to know if baldness is asociated with some evolutive treat.
"You can wear whatever costume you want for Halloween and it's totally cool but here's a list of costumes I'll shame you for and call you sexist and racist if you do wear them"
- Laci Green 2015.
Compensate with beard.