To elaborate on the second point, the US Constitution having been in continuous effect for nearly 250 years truly is rather impressive from a legal history perspective.
Nonsense, What you are claiming isn’t even true… The latest amendment stems from 1993. Your definition is based solely on some completely irrelevant parameter defined entirely to fit only one single country.
If you choose to ignore amendments, sure. But nobody would do that with any good faith in this nonsense discussion.