Wood continues to cure and harden (and shrink) when it's put into place in construction - in 70-80 years, It'll be just as hard as the wood in a house from 1890.
It simply can't - it's effectively not the same material. Just in terms of growth rings, wood density, heartwood content, etc.
Wood continues to cure and harden (and shrink) when it's put into place in construction - in 70-80 years, It'll be just as hard as the wood in a house from 1890.