IMO people in this thread have missed the point. I, too have moved about every two years as an adult (even though I've never had mold problems). Or when I haven't moved, I've made a job change.

Perhaps there is something in my nature that gets complacent after a couple of years and looks to make a change. It seems like that's what the author was trying to grasp towards.

I expect this tendency might go away as I get older, have a family, etc.