It's mind-boggling to me to think about how long 70 years of reign actually is. How many world leaders she has seen come and go. How much the world changed since then.
Winston Churchill born in 1874 and Liz Truss born in 1975 were her first and last Prime Ministers.
[1] https://en.wikipedia.org/wiki/List_of_longest-reigning_monar...
(2022 - 1952) / (2022 - 1789) = 0.30
You're right if one starts counting from the declaration of independence, however, yielding 28.5%.
The Articles of Confederation wouldn’t even be a footnote, just a dusty document in someone’s library, maybe, and the Constitution would never have been written.