While some things can surprise us with their age, there's a reason we tend to ask "how old" something is rather than whether it's old at all.
It tends to be pretty obvious. So how well it's held up over the years depends a lot on exactly how many years it's had to endure. A worn-out chair, for instance, might look ready for the scrap heap if it hasn't lasted 15 years without seeming like it's about to fall apart.
But if a chair in similar condition has stood for over a century, it feels miraculous that it even still exists. And while we won't have exact fixes on how old everything on this list is, we'd probably be able to make some reasonable guesses.