Though Ryan isn't completely bald just yet, I am shocked at how much hair he has lost in a short period of time.

- I believe this was taken in the fall of 2007

- 3 years later
Andrei Kostitsyn is another that comes to mind, but I am in awe over how much hair Getzlaf has lost in the last 3 years. He was 22 in the first photo and he's 25 now.
Sometimes it just happens that way. It's always better to take control of the situation, and that's where a nice tight buzz or shave helps.
could be steroids 
Oh I see he's an Athlete and he's balding, gotcha.
Or it could be that he's getting older and genetics can be a pain in the butt.
He has money, so I doubt he's concerned.
Look at Prince William. (Ick!)
Also, when he finally does realize he's balding, I'm sure a quick trip to BOSELY will set him straight... and then Bosley will convince him to be their spokesmodel and lure in a bunch of innocent people... thus, scarring (physically & mentally) a bunch of young and unaware men.