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In the current state of the NFL, running backs have some of the shortest careers in the league. Once backs hit 30, it's usually a quick downfall with decrease speed, power and elusiveness. Ryan Grant will turn 29 during the season. He hasn't hit the magical wall of 30, but he is getting up there in years for running backs.
Grant is also coming off a nasty ankle that placed him on injured reserve causing him to miss the remaining 15 games and the playoffs. Grant has vowed that his injury was not as bad as advertised and that he could have come back if the rules for injured reserve were not in place.
For a younger back, Grant's injury may not be the biggest deal, but it certainly has brought up the question whether or not Grant will get back to form. In training camp he has looked average, but has not had the same explosiveness that he possessed before last season.
If history is any indicator, Grant could be in the beginning stages of a gradual decline that many players his age have faced. With a talented young back nipping at his heels, Grant could be dealt to avoid the Packers having to worry about this potential outcome.