I can tell you new car stories that end in a breakdown. Heck my mother and a friend went on a trip, and the new car she picked up the day before and left in my mothers garage, didn't start when she got back, three days later (electrical problems). Getting stuck doesn't just happen with used.
I tend not to worry about age and just look at the vehicles for what they are and how they have been maintained. I have seen 20 year old cars with 30K from elderly people that really didn't go on the highway much, but those that bought them for general driving and replaced a bunch of the rubber and flushed/filled fluids had no issues, while sixteen year old kids could blow them up by trying to race them and doing no basic maintence.
My main vehicle is a used 2005, that I knew the previous owner (girl that passed that worked for us, and the kids of the prior owners who passed). It now has around 130K and will last me a long time.