Could just need a wheel true. But, because of it's age, it's possible some spoke nipples are frozen. An overhaul should be possible, but take it to someone with patience who will oil the nipples and give them time to loosen. Also, with a 25 year old bike, if you plan to ride this very much, get all the bearings repacked in grease - old grease ceases to be grease. This kind of overhaul might cost you $150, or do it yourself for the learning experience. Alternately, drip oil into anything that moves and just enjoy riding it.