The men who share my Y, all my brothers, dad's brothers, their sons, on up the line, never go bald. Never ever. All of their daughters, who have sons, are not bald, even when they marry bald guys. When we marry daughters of bald guys, no one goes bald. We also have almost no body hair and struggle to grow beards. My sister's son, whose dad is very bald, has super full hair and bear-like beard and body hair.
Native Americans also would not go bald or grow body hair until colonization. My family came from the ancient aristocracy of France, often written as the most ancient.
My conclusions. Baldness is carried on the Y, and those Ys pass it to the X. It probably has to do with the lack of a gene more so than a mutated gene. Treatments or theories related to elevated testosterone or stress most likely have a degree of validity among the men whose Y carries baldness. I view baldness as a symptom of a condition, not the actual condition. I view blond hair to have the same source, or same type of condition. I feel elevated testosterone and body hair is the body's response to this condition.
Currently I am looking at the physical length of various Y haplogroups as the cause, and the gametes interactions as the mechanism to determine the degree of hair loss. The elevated testosterone being the body's response. I feel professional investigation of this hypothesis may lead to the discovery of many genetic illnesses, as well as genetic predisposition for general health. Amazingly, this effect and conditions related to it appear in very old histories. I began to look into this while writing a comprehensive history of my family. If anyone with the means to professionally investigate this wants more information, please contact me.