GSP does have a good head shape and being in great shapes helps a lot too. The upcoming GSP vs Serra is a good one for the baldies. Both guys have shaved heads, Serra seems to be actually losing hair but still looks ok for a short, stocky guy (better than George from Seinfeld).... Hair aside...
You should go see a doctor and check your thyroid levels, they're probably low since one of the first symptoms of low thyroid levels is thinning of the eye lashes and low thryroid can cause hair loss as well. You might have male pattern baldness as well but low thyroidism will make it worse as well as add more...