My former Dyer Dink is still going strong at 81yrs old. I did a complete restoration on her 20 yrs ago. My Cal25 is still very sound at 43 and my San Juan is like new at 24.
My former Lightning had a date with a chainsaw because of severe neglect by her first owner. His answer to maintenance was to slap on another layer of glass. I spent a couple of years chasing rot between sailing seasons then gave up and scrapped her.