My GF is selling her vehicle and going car-free. We can do this because I still have a car, a 2000 Toyota Avalon, for those times when a bike just won't do. I get the itch to get a new(er) car every now and then, but the Avalon, at about 100,000 miles, just keeps on doing it's job, with (knock on wood) no mechanical breakdowns so far. Next year it will be ten years old. Oh, and of course, it's paid for. No car payments in many years.
Unless the car-free experiment doesn't work for GF, I'll probably keep running the Avalon until who knows when. If we really need two vehicles, I'll keep the Avalon and add something like a Honda Fit. My car is showing a little sign of age, with some scratches and a couple of rips in the upholstery, but it runs fine, gets 20 MPG, and is roomy and comfortable for longer trips.
Anyway, I got to wondering about the 50+ forum folks and how old your newest car is. When do you think you'll replace it?