> the testosterone which can cause boys to stop growing early, by closing the plates at the end of their bones during their teenage years
Early plate closure is caused by too much estrogen too early (giving those boys aromatase inhibitors raises their testosterone and makes them grow taller, faster) and premature balding is caused by the hair follicles having an abnormal response to DHT and getting inflamed and ditching their hair. In both cases you have abnormal hormonal responses and not necessarily high testosterone.
I have browsed hair loss forums because the topic is personally interesting, and a lot of men report rather abnormal hormone levels for men, often low testosterone and high estrogen, etc. The newest that I have read is from people hoping to restore hair by modifying levels of PGD2 and PGE2. Unfortunately they have to experiment on themselves because regular medicine offers nothing.
In other words, DHT is needed to mature men, but some men don't have theirs turned down as they “should.”
I also find it an interesting topic. My son at 15 YO lost ~60% of his head hair due to alopecia. American medicine just wanted to soak his head in steroids. I said no, and sent him to China for the summer after his 10th grade for treatment using Chinese medicine. He started the 11th grade with a full head of hair and it appears to be a permanent cure (3 years later). He told me that I should go to China too because the treatment also works for male pattern baldness (so he says).
I have several bottles of his assorted potions left but since the labels are all chinese I have no idea at all what's in the stuff, except it is not "drugs" in the western sense but more like homeopathy on steroids (urp).