Older means cents in the bottom under floorboards, and only makes sense to lift the floorboards to see. I ended up with holes rotting the hull at 4" ahead of transom .Filled with large ss carriage bolts and j b weld .Thin gage hard to weld. Rivets can be tightened with air hammer and anvil .rear rollers on trailer made dents .bow eye comes loose and tares out ,big leak there .as the boat sinks all the time need to watch the scuppers on the transom motor well as caulked edge fails. Rubber bung metal part breaks from constant drainage, wet boats that need clean fishermen to keep the bulge pumps running.