Why is a younger, higher mileage car a better buy than an older, lower mileage car?

In your answer to 'Three Pointed Tsar' on 6 October you said that it is better to buy a car with mileage too high than too low. Why?

Asked on 24 November 2012 by CH, Bibury

Answered by Honest John
Generally the rule is that for the same money, a younger higher mileage car is better than an older lower mileage car because the older car is still an older car and will probably be in a higher emissions and tax category.
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