Ahahaha. Perfect.
Yup
They’re talking about the technical calendar decades from the beginning of time, while the original comment was about living in different decades.
As proof that our position is correct, I refer you to Time Life “Sounds of the 70s” record collection. The earliest song? 1970, the latest? 1979.
Coincidence, or enemy action? You decide.
https://en.wikipedia.org/wiki/Sounds_of_the_Seventies_(Time-Life_Music)
Ahahaha. Perfect.