18. Frank Gore, San Francisco 49ers
Under normal circumstances, there would be little red flags going up every time Gore stepped foot on the field. He’s on the wrong side of 30 and has all kinds of mileage on his tires. But Gore is simply not showing any real signs of slowing down. In 2013, he put together his seventh 1,000-yard season in nine years, and stayed healthy despite carrying the ball more than 250 times. Solid until proven otherwise. (Ronald Martinez/Getty Photo)
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