I just finished a valve job on my car.
My car has 250K+. It was consuming 1 quart of oil for every gas tank. In my case, I think it was a combination of a leak in the front upper timing chain cover and bad valve guides and seals. If you don't mind small leaks and keep an eye on the oil consumption, your car should last for another 100K miles without touching it. You can also try replacing the seals to minimize oil consumption, which can be done without taking the engine apart, and it is relatively cheap. Keep up with oil changes.