My boyfriend is very self-conscious about his hair loss! help?

So I am in a long distance relationship with a guy I am in love with. Recently he opened up to me about being self-conscious of his hair loss... I haven't even noticed and we skype/send pictures/etc. regularly. When i talk about meeting him, he says things like "by that time idk why you'd even want to see me anymore though" and "you might think differently when I'm bald in a year" and he told me he "can hardly even look in the mirror anymore"

I hate that he feels this way about himself... I tell him I love him and it does not make a difference to me and I will always find him attractive but he just does not seem to believe me. He has said to me "you deserve so much better than me" and every time he says these type of things it makes me cry. I don't know what to say to him to make him feel better about himself... I have already told him that hair loss is natural and every man goes through it at some point in their lives... I've also asked him if he would love me any less if I lost my hair since women can have thinning hair too... he said he would never love me any less.

So my question is... how can I make him feel better about himself?What can I say to him? I hate that he is sad all the time because of this, it breaks my heart.

thank you for anyone who can help :)

more details... he is only in his early twenties.

This makes him hate his hair loss even more... he feels like he is aging before anyone else and that he is the only one that is going through this