To those from the Western hemisphere, it’s always fascinating to hear that some homes and businesses from the times of the Greek philosophers still have inhabitants, and then you remember that the Western hemisphere is itself not without its own examples, for example some Mexican villages still have temples from the times of the Mayans.
Its very hard to find anything in the lower 48 and Canada (Your right, Mexico has a lot more preserved sites) that are older that 400 years old. I was recently out in southern Utah and there are petroglyphs around Moab, some depicting horses which dates them to no earlier than the mid-1600s. Others are believed to be significantly older.
Meaning Ive seen something in the US that is older than your mum. /s