I read a while ago that if a male keeps most of his hair by the time he is thirty, he probably won’t go completely bald. It has something to do with testosterone levels. Is this true? If so, is it also true for individuals who keep theie hair by the use of Propecia or Minoxidil?
If you have not lost any hair or have any miniaturization of the hairs on your head by the time you are 30, then it is most probable that you will not lose it. The drugs you mentioned only slow down or reverse hair loss and they will not impact hair that is normal. Hair loss has more to do with DHT than testosterone, but if there is more testosterone, then there could be more DHT. Drugs like Propecia (finasteride), block the effect of DHT and it is the DHT that causes balding when the defective genes are in the person.