I'm looking at a 91 stratos 285 allpro silverstar 19' w johnson gt175 , hoot foot, jack plate and straros trailer. The boat looks to be in great condition, the only flaws are the courtesy lights dont work and there is a small tear in butt of driver seat. the guy wants $6500.00 for it, is this good or bad? also I was told not to buy a boat 15 or more years old because thats when they start running into problems is this true?