John Lopez: Guys like Favre can cheat calendar, but RBs still hit wall at 30

[SRNewsBot]

This week, LaDainian Tomlinson and fellow 30-year-old Brian Westbrook -- arguably the greatest players ever for their respective teams -- became the latest superstar running backs to learn a painful lesson. Players at other positions might cheat the calendar -- Brett Favre, Kurt Warner, Darrell Green and the like -- but for all the advances that keep others in the game long past their prime, running backs still hit the wall at 30.

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