Football is a young man's game.At least, that's become the norm in the days of NFL salary caps and rookie wage scales. When teams can stack up exceptional players on rookie deals, that usually means great results on the field.Names that should come to mind for Dallas Cowboys fans are Ezekiel Elliott and Dak Prescott.NFL.com's Elliot Harrison recently compiled a list of the top players league who will be under the age of 25 when the 2018 season begins, but only one Cowboy made the list.