At 15 I'm 5'11'' and 147.5 pounds, or 180.34 cm and 66.9 kilos. I take after my father physically so I will probably be 6'3'' or 6'4'' and about 165 or 170 pounds eventually. I think I have a pretty average shape. I only do some occasional archery and a ping pong game every day or three (though I'm hoping to get into weaponsmithing), yet somehow I manage to keep a good weight, shape and strength. I have fair skin, blue eyes and brown-blond hair in a buzz cut. I certainly don't have a hairy back yet, but later on is anyone's guess. Most likely I will briefly experiment with facial hair and then realize it looks ridiculous and stop.
Edit: corrected metric height.