Unfortunately Nick didn't decide to go to the actual numbers. We're neither significantly young, or old, we're somewhere in the middle. The majority of the starting lineup is made up of upperclassmen, true juniors.RS Soph with a sprinkling of 4th and 5th year guys. If you've done your job from a development standpoint it's rare that you ever a team made up of 30-35 seniors. The bulk of most teams rest in the junior classes.
When you take a lot at the projected starting lineup what you find is.....
QB- Gardner - 5th yr
RB- Green/Smith - 2nd yr
FB- Kerriage- 4th yr/Houma-3rd yr
WR - Funchess - 3rd yr
WR - Chesson/Darboh - 3rd yr
WR- Canteen 1st yr/Norfleet 3rd yr
TE - Butt 2yr/Williams 3rd yr
OT- Magnuson - 3rd yr
OG- Bosch - 2nd yr
OC- Glasglow 4th yr/Miller 4th yr
OG- Kalis - 3rd yr
OT- Braden - 3rd yr
DE- Clark - 4th yr/ Oljemudia 3r yr
DT- Pipkins 3rd yr/Henry - 3rd yr
DT- Wormley 3rd yr/Godin 3rd yr
DE- Beyer - 4yr/Charlton 2nd yr
LB- Morgan 4yr/Gedeon-2nd yr
LB- Ryan 5th yr/Bolden 3rd yr
LB- Ross-3rd yr/Jenkins-Stone 3rd yr
CB-Taylor - 4yr
CB-Countess - 4yr
CB-Lewis - 2ndyr
S- Wilson - 3rd yr
S- Hill/Thomas - 2nd yr
So out of 24 positions (taking multiple sets into account and leaving summer enrolless like Peppers out) we're looking at 5 being maned by an underclassmen. 19/24 of the lineup will likely be madeup of upperclassmen. That's not young.
Now the number of career starts, particularly offensively, aren't as high as you'd like but guys should be ready to play once they hit upperclass status regardless of prior starting experience. This isn't the NFL, you're always going to have to break in new starters in colllege football. If you're upperclassmen aren't ready to be first year starters that's on you.