Personally I wouldn't buy a six year old car or a car with more than 25,000 - 30,000 miles but that is just me
I disagree. Too low of miles can and are a problem in cars 5+ years old. They usually sit too loong and gum up. Rough idle, early tuneups, and other fuel related issues can happen. My rule is 5-10 years/ 50-100K. 10+ years 100-200K.