Frank Gore wants those around him to notice just how hard he's running at age 31, seemingly as energetic as ever when everybody is beginning to question when he will slow down. Or break down.

Ask him how his body is holding up, how he feels, and Gore quickly offers a good-natured retort: "You tell me how I look."

So far in 2014, no words necessary. The veteran San Francisco running back reached another milestone in Week 1, becoming the 29th player in NFL history to run for 10,000 yards — and just the 10th to accomplish the feat while playing for the same team for at least 10 seasons.

Despite Gore's youthful spirit, the 49ers still face a delicate balance of keeping him fresh and giving rookie Carlos Hyde chances, too.

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