Corrosion will occur almost as fast for a low miler as a high miler. I'd take a good look underneath. Old cars last longer living in a dry garage rather than getting moist with condensation most nights.

True in principle, but not necessarily a strong negative factor. My Pug 207, which may have come from the same factory, has never been kept under cover, but underbody corrosion has never been mentioned at any annual inspection - now at 84K miles (2008). And I have never tried to hose it underneath - tho I may have treated the wheel arches once or twice.

Of course a buyer should check this for himself, but age alone does not automatically mean rust.