If every man took dutasteride from puberty, none of them would go bald. We know this from the condition 5-ARD. Obviously that's not a good idea, since DHT is im

If every man took dutasteride from puberty, none of them would go bald. We know this from the condition 5-ARD. Obviously that's not a good idea, since DHT is important for fertility and many other male secondary sex characteristics. The point remains though, if you were able to know that you would go bald, and started taking finasteride or dutasteride before noticeable hair loss starts, that would likely be sufficient for life.