You always hear how important it is for NFL teams to have great balance, and although most people are talking about on the field, this applies off it as well. Teams don't like to be too old because they can be injury prone and slow or too young because they lack the experience needed to win championships.
At the NFL level, you need the Just for Men's Touch of Gray solution: a little youth mixed in with some veteran leadership, and you have a pretty good combination to win.
Just because you have youth doesn't make you competitive, though. You need young guys who can play and just about every team in the league has just that. So let's look at each team's best player younger than the age of 25.