Fine for the age.
Well the 2012 cars will be out shortly. So for a 10 year old vehicle thats less than 10,000 a year, which is BELOW the average use.
The milage is not an issue at that age car. That said there are things that can go wrong with ANY 10 year old car. Have it inspected at a shop that does this all of time, and make sure the basics are OK like brakes, ball joints, steering rod-ends and frame integrity. Around here the local Franchise of MIDAS is very good (mechanics are on salary, NOT parts commissions). Who is good in your area--- use that shop.
A known issue is to look at the frame. They rust over time of course, especially if used where there is winter road salting, basically from the inside out. A particularly vulnerable spot is at the bend, just in front of the rear wheel. Now there are repairs for things like that, but it doesn't sound like you are into that route.
By the way, make sure you REALLY want a "Jeep". Be aware that it is a VERY short-wheelbase, 1/4 ton 4 wheel drive TRUCK; and as I have heard some people say "a poor substitute for a car".