A car will lose less of its value as it gets older, because its worth less. Applying that logic you should drive it into the ground... Other factors to consider; most dealers are only interested in 2,3,4 year old cars when trading in against new. A new model car may hit the older's values. Mileage and major service intervals are a factor. Depending on the model once a car hits 60K or 80K miles, major parts may need to be replaced (timing belt is sooner). Alot of people won't look at a car, irrespective of model or condition if it has 100K+