In places like Boston there are many 100+ years old stick frame houses. They hold up just fine. Properly built wooden houses don't get any mold.
... or so you think. Mold contamination is most of the times invisible and triggers long-term chronic intoxication. People only realise there's a problem if the mold starts growing on the walls, at which point it's too late.
I have family like this.
Prolific recent media example: JK Rowling.
ChangeTheAirFoundation.org