Interesting to hear it sold that way; it seems kind of counterintuitive. Sitka spruce trees can be 500 years old when cut, and Adirondack trees should be at least 200 years old to reach 20″ dbh (diameter at breast height, one way of measuring trees). Certainly the time elapsed since cutting can affect the physical properties of wood, but that’s reliant on a large number of factors….
Instruments get better with time and playing and care. Two of those you can control…..