Since the mid 17th century, really. And does not currently exist as an independent nation. Which is exactly the point, they were making.
The US is certainly not the oldest institution in the world. And as a people, as a culture, yes, the US is rather young. But the US is relatively mature as far as continuous national governments go, and the oldest surviving democracy.
Red: the blood of angry men.
Green: the blood reptilian healthcare CEO’s.