> It's always amusing to find out what Americans think is old.
It's not that we "think" those buildings are old. They are the oldest. There are no older buildings. Age is relative. If you colonize a pacific island, the oldest building will be 1 year old. That doesn't mean the colonizers think 1 year is a long time.
If you want to get into a manhood measuring contest we could broaden the criteria to include native american structures.