How long do you keep your cars?

We kept our cars about 100,000 miles in the past or until they became too much of a burden. Only the two Fords were so bad that we got rid of them before 100,000 miles. Our 2 oldest cars are both well over 100,000 miles now, though, and we intend to keep them for another 3 years if we can. That would put them both at around 150,000 miles when we retire them. College tuition bills will do that to you.