It should be noted that old growth wood is significantly higher quality wood than what you'd get from most stores these days. The fast-growing wood is flimsier and less rot resistant, but it can also be replanted and replaced quite easy.

Only using old growth as a source of wood would cause quick deforestation of the remaining old growth forests and nature reserves only for the trees to be replaced with the worse trees we use today. It would only work once, the next generations would still get the crappy quick lumber we use today or be stuck without wood while waiting for forests to regrow, so it's not really an option. If we go for wooden houses everywhere, we're going to need to use the "industrial" wood.