Brent, I've killed turkeys similar to that one before, and have seen several others posted on turkey forums. I think it's just a genetic difference that keeps some gobblers from ever growing spurs.

The best method that I have found for determining if a bird is a 2 year old or an older bird is to examine the end of the beard. A 2 year gobbler will have a lot of amber tips, while an older bird will have nearly all black tips. This is pretty easy to see on a gobbler in the Southeast, but I'm not sure how well it works in areas that have lots of snow and ice.

Here's a pic I made to try to show this. If you number them from left to right, birds number 1 and 3 are obviously 2 yr old turkeys, while 2 and 4 would have to be at least 3 years old. Their spurs would support these estimates as well.