Keep it! Don't listen to the people who talk about what a car's resale value is. Who cares? You probably haven't had a car payment in almost 20 years, yes? And hopefully you're not paying collision insurance, so you're way ahead of the average get-a-new-leased-car-every-3-years person, money-wise.
I have a 1994 Nissan pickup. I love it. I love rolling the windows up and down with my arm. I love that it doesn't have a computer screen mounted in it. I love that the body is not made of plastic. I love that it gets 30-40 miles per gallon. I love that it has a standard transmission. People put notes on my windshield asking if I want to sell it, because they know it will run forever. Personally, I plan to keep driving it until it falls apart.