Worst thing to happen to a young man outside of extreme health conditions. Think about it, you're in your prime and youthful in every single way. Everything is a new experience, it's the time to look your best and be care free - a time you can never get back - that innocence. You want to look your best not just for girls, but for yourself, friends, new people and at least look normal. You are not supposed to be "ageing." Serious baldness between 18-23 robs someone of their formative care free years and you immediately stand out in a bad way. Everyone has a full head of thick hair. Can't even comprehend the psychological and physical damage.
It tells you something that when women in their late 20s and 30s are told ageing is generally tougher for them, the first thing they say is but you guys lose your hair. It's true. That's the Achilles heal for a man and a great leveller. If balding can potentially destroy a man's aesthetics in his 30s and 40s, what about a teen? Remove this much older guy's hair and suddenly he will lose a lot, right now he looks attractive and distinguished for his age.