At 15 years and 180k miles I figure my truck is just about middle age now. I bought it used at 6 years with only 24k miles on the clock. While easy miles rate wise its first 8 years were spent in snow and salt winters. Since then I've been winterizing my RV by parking by a palm tree, catus, or both.
Before hitting the road in 2011. Moreover, before saying goodbye to my garage and work shop. My truck got a good once over, including new front brakes. At the time I noticed that the parking brake mechanism was seized from rust. But local auto parts stores at the time couldn't seem to get the parts needed to fix it. I rarely used the parking brake anyway. So time passed.
A couple summers ago I noticed a minor problem developing. There was