Yup.
Or you could say, common sense talk versus poindexter/nerd talk.
Yup
Theyre 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)