METAIRIE, La. -- NFL running backs are supposed to slow down once they hit the age of 30. But the San Francisco 49ers' Frank Gore apparently hasn't gotten the memo. The ninth-year veteran has run for 700 yards and seven touchdowns this season, on the heels of back-to-back 1,200-yard campaigns in 2011 and 2012.The 5-foot-9, 217-pounder has always stood out as a power runner. But he's surprisingly slippery as well. Just like the New Orleans Saints said two weeks ago after their game against the New York Jets, teams know that Gore is gonna be running the football "stepping off the bus.