I'm still "youthful" in my 2002 TJ with well under 40K miles. I bought it used about 4 years ago, and it was low mileage then. I use it for trips and as a back up most of the time. Looking to retirement and trips to Rubicon and Mojave trail and other great Jeep trips.
My son just bought a Cherokee with 235K miles, original engine. The paint is lousy and the interior is fair, but the engine runs strong and there is no evidence of a rebuild. He's having a ball with it.