Welcome to LOST, and sorry you are having these issues at only 70K! Do you notice any driveability problems yourself?
If I were you I would get a second opinion from a different mechanic. If you are the first and only owner and you have never taken the Jeep off road or towed heavy loads, I would be very surprised to see this kind of damage. If there was a previous owner, you never can tell what they did to abuse the vehicle before you bought it. See if a different mechanic comes up with a similar diagnosis or whether this first shop is trying to make you pay for unnecessary repairs.
Good luck with the Jeep!
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2008 Liberty Sport 4x4 Automatic
Jeepin By Al 4" Lift Kit
BFG KO2’s 245/75R16
Full MOPAR skid plates
Rock Lizard Skink Super Sliders
AtTheHelm Front Recovery System & Roof RackM116A3 Trailer build thread: viewtopic.php?f=72&t=77997