QB: Smith, Kapernick
RB: Gore, Hunter, Dixon
FB: Corcoran, Miller
WR: Edwards, Crabtree, Morgan, Johnson, Ginn, Williams
OL: Staley, Boone, Iupati, Wragge, Goodwin, Kilgore, Snyder, Rachal, Davis
TE: Davis, Walker, Reuland
DL: McDonald, Jean-Francois, Sopoaga, I.Williams, J.Smith, Tukuafu
LB: A Smith, Applewhite, Brooks, Willis, Bowman, McKillop, Grant, Haralson, Castonzo
CB: Rogers, Spencer, Brown, Adams, Culliver
S: M.Williams, Spillman, Whitner, R.Smith, C.Jones
ST: Akers, Lee, Jennings
The average age of that roster is... 25 1/3 years of age.