I am looking at 2001 Mercury Grand Marquis with 36,000 miles and a 2004 model with 98,000 miles. The car went through some major changes in 2003 such as coil-over-spark plug, knock sensor, slightly more rigid frame. Otherwise the two years have similar options. They are both driven by caring senior citizens, so they are in good condition for their respective year and mileage.
Assuming the prices are not an issue (assume the two cars are appropriately priced respect to their model years and mileage), and you plan to drive about 15,000 miles per year for next 5-6 years before selling it, which car would you buy.