There are pills and snake oils aplenty aimed at slowing hair loss, but you really only need to know one simple equation to stay attractive post-mane.
Bald + fit = attractive.
Conversely: Bald + unfit = not so good.
Can guys with great hair get away with being unfit more than guys with no hair can? Yes. They shouldn’t do that. But they can.
And no, it’s not fair. Life’s not fair. Now go deal with it.