“Old growth” wood isn’t materially better for construction along most axes, and possibly all that matter (example: modern SPF is roughly as rot resistant as “old growth wood”, but we also have way better ways to keep it dry too). Construction requires straight-enough material with sufficient flex (compression strength is a gimme) that can effectively hold fasteners. The “crappy quick lumber” that old people complain about today is actually, genuinely fine for what it is intended to be used for and fifty years from now people will be complaining about what they can buy at Robo Home Depot with the same fervor that people complain about modern silvaculture today.