Maintenance is the issue not age. Age only allows the effects of no/poor maintenance to accumulate and eat into the safety margin. The wood wing Citabria is an example. If the nails come loose and the ribs float long enough they can damage the spar enough to be an issue. Nothing wrong with it if you maintain
world of warplanes. I had a 1974 7KCAB and enjoyed it for 650 hours. Same kind of issue with rust inside the struts on almost any high wing. A good pre-buy becomes more critical as the airplane gets older and the mission more demanding, like akro. That way you are confident of your starting point.