[BSousa]

I started losing mine at 17 and I worked out/moved a lot at the time (played 2 sports + fun activities) so I doubt there is a connection there.

[ghthor]

Male pattern baldness is directly linked to testosterone. I believe is also linked to stress. If you're TOO active and causing high levels of cortisol in your system then you'll probably go bald early.

[corin_]

Your single point of data (anecdote) isn't really any more useful than his. I know at least one very old person who has smoked all their life, for example.