SANTA CLARA, Calif. -- Apparently, no one has informed Frank Gore he turned 30 in May.Turning 30 is generally considered the beginning-of-the-end birthday for NFL running backs. Often, great running backs see their production drop dramatically after their 30th birthday.But halfway into the 2013 season, that is the not the case with Gore. In fact, in many ways, he's on pace for a career year.Through eight weeks, Gore has 618 yards on 146 carries with seven touchdowns.