Re: Life span of an entry level open bow?
Two comments. To me, one of the most overlooked area of boat wear and care is the interior (vinyl, seat etc). I've seen several "older" boats with hulls and drives in pristine condition, but the interior was shot. Broken seats, ripped seat covers, stained carpet etc. If you go with a new entry level check out the interior constituents to help make the decision. It's exposed to the sun and depending on your use, it can really take a beating.
Second comment, a 20 year old boat was made in the 80's. This was a time of increasing EPA regulations and consequently formulation changes in the resins. Also a period of high demand and initial changing of building habits and manufacturer ownership (weren't some of sea rays' runabouts made in Ireland during this period?). Anyway, a 30 year old boat will probably be heavier, more durable (and less efficient) than a 20 year old boat.