remember that episode in s6 e20 TMWBK? When hes praying to god, he says that his brother told him not to step on that fish, that's an older brother talking to a 15 year old, that also means that Cas is younger than Earth, even younger than some of the organisms including fish. Now fish started climbing on land during the Devonian period of the the Paleozoic Era, which was 358 000 000 years ago And if you think that's old, the archangels are older than earth, over 4,878,000,000 years old
OHMYGOOOSH!!! YOU DID ACTUAL LIKE, MATH AND. HISTORICAL KNOWLEDGE! (I don’t know what I was expecting BUT I AM DEEPLY IMPRESSED.) THAT ALL MAKES SENSE THOUGH, BECAUSE THE FISH AND THE HISTORY AND THE EARTH AND STUFF.
Holy goodness Gabriel is old.