My dads/grandads mk2 gti was sold with 144000 miles and was in good condition, that was a design 15 years older than a mk4, cars can go further these days, providing it hasn't been abused and had regular maintenance mileage shouldn't be too much of an issue.
Without pampering a 10 year old mini was fooked in the 70s, now a its 10 year old equivalent is in decent nick unless its been unlucky. 100000 miles is no longer the pension age for cars (not for a long time now).