The other challenge to starting hockey so late, is it is hard for a 15 year old to find a legitimate team/group to start on. They have the playing ability of a 6 year old mite, but obviously they can't join that team. They can join a rather "non-competitive" midget team, which is likely to be a team that is horrible, and doesn't see much in the ways of talent progression. Then you get a bit of a spiral where the game is no fun at all for the new hockey player.
It's funny, you can go to a pond in the winter and actually find some pretty good players who have absolutely no competitive hockey experience but can skate, stick handle, and pass pretty well. However, you put them in full pads and in a game 5 on 5 with a legit goalie and they would be lost.
If you are athletic and 15 years old, it's not hard to jump into a soccer game and run fast, understand space, get open, etc. Same can go for basketball, ironically though most hockey players are terrible at it. Natural athleticism can only go so far in hockey if you can't skate, or can't skate with your head up.