Besides the years & miles, it also depends HOW it was driven. Did it see salt roads in winter? Did it tow heavy loads? Crappy roads? Was the driver prone to gunning it and stopping fast, etc?
Since so many other things can create wear and tear, try first finding the car with the age and range you are fairly comfortable in, then get it inspect yourself. Then take even minor things to the buyer and use those to get a lower price on the car. This way you'll save money getting a reliable car that you really want.
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