This isn't a ranking. This isn't a list. No, not in a simple manner, at least.
This is a collection of some of the best talent and potential the NFL has seen, only for them to leave the game early-and on their own terms.
With Brett Favre having a phenomenal season in 2007 (28) touchdowns, retiring, and then coming back to have another solid statistical season-it makes you wonder what some other guys could have done if they'd stuck around.
Here they are, ranked in accordance to age.