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After doing some more research, I found that I was right about the fact that DHT is the cause of more body hair and less head hair, but it is NOT a byproduct of testosterone. Apparently, it is a byproduct of not having enough testosterone. It is evil stuff, though. It is why you see a lot of fat bald guys with hairy shoulders/backs/chests, and thin guys with plenty of head hair and no chest/back/shoulder hair (genetic lotto winners). I think I am going to up my Proscar dose after reading more about this nasty hormone. Yikes.

In your case, I guess you are producing DHT in just the right amount to cause hair growth in other places, but not enough to make your head hair fall out. Lucky! I have to eat less than 1k calories a day and zero carbohydrates to stay in the just overweight category, use a couple of different drugs to keep my head hair, and shave my ears every few days. The other body hair I can live with. If I let my ears go, I look like I'm wearing earmuffs after a couple of weeks. I'm 42 - 15 days younger than soon-to-be VP Paul Ryan. He's skinny and has a serious head of hair - and it isn't even turning grey! Yet another genetic lotto winner. Although I don't think he eats carbs, either. I have been living with this crap since my early 20s, and I was bald by 28. Thank heavens for Minoxidil and Proscar!

DHT is separate hormone from testosterone, although it is produced 5a reductace acting on testosterone. There are 16 year old boys with Androgenetic Alopecia. The condition is not caused by a lack of testosterone. It is also not caused purely by DHT, otherwise all 16 years old boys would be balding. There are a number of factors including inflammation, dmage to the skin and hair, and genetics in Androgenic/Androgenetic Alopecia. TGF B2 and ProstglandinD2 pathways do play a role. Men in poor shape tend to bald earlier because they are epigenic nightmares. Also high glucose and A1C levels correlate with inflammatory damage to the hair follicles in both Androgenic Alopecia alone, but especially in Androgenic Alopecia in women who have PCOS, where this has been studied.

I'm not an amateur here.