I agree with you that 100 years is not very long - I chose that number because a lot of communities in America aren't a lot older than that. The idea of a subur

I agree with you that 100 years is not very long - I chose that number because a lot of communities in America aren't a lot older than that. The idea of a suburb didn't really catch on until after WWII, so we don't really have much data on those beyond 60 years. And even beyond that, a lot of areas in the midwest/west weren't very settled until around the turn of the century, so permanent structures from before then are not common.