Earlier quoted context omitted.
I'm not super well versed but my understanding is that that's right, with your actual DHT levels being the third variable. There are other non-hormonal causes of hair loss, like alopecia areata, but they're much less common. DHT damages the hair follicles that are sensitive to it, causing them to grow back thinner after each growth and shedding cycle (which is typically a few years). As a result most men don't have v…
It's interesting because there are medicines that can block DHT or reduce it's effectiveness, but they have other negative side-effects. It's almost like if you have this gene and are a healthy man, you should loose your hair - I wonder what the evolutionary mechanism of that is.
Maybe in the past the fact that someone had survived long enough to go bald or grow a big beard would signal that they had the skill or hardiness to avoid dying young, which might make them more attractive and likely to pass on the gene.