Mileage isn't the only factor you should consider when buying a used car, but “good” mileage is typically considered anything under 75,000 miles.
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In fact, with proper maintenance, many cars can last several hundred thousand miles before you begin to notice anything wrong with how they drive. If you bought a car that has 100,000 miles on it today, you could realistically drive it for another 10 years without significant problems.
Cars over 10 years old can still be reliable. Most vehicles can last well over a decade with proper care and maintenance. In fact, the average car on U.S. roads is now 12.5 years old, according to a study from S&P Global Mobility. Furthermore, a car doesn't really stop depreciating until it hits that 10-year mark.