Edit.
It seems you are correct. I thought I joined Nostr in early 2022 but now that I checked it was early 2023. So I have been here for 1.5 years and Nostr have existed for 2.5 years or something like that.
Discussion
It’s not that old
As far as I recall, Nostr existed for a year before the great Twitter-Nostr migration in 2023.
Buuut considering that I mixed up 2022 and 2023 I can't be certain that my memory is correct.😄
I looked it up, early version of nostr protocol December 2020. The "great Twitter migration" to Nostr late 2022 and early 2023. Right around the Musk takeover.