Bitcoin grew out of the cypherpunk movement, which started in the 70s-80s. A lot of pioneers of bitcoin came from that movement: Adam Back, Hal Finney, Nick Szabo, probably Satoshi Nakamoto, etc. So, Bitcoin was birthed by a bunch of old guys.

I'll also take the opportunity to rant a bit. Out of those four I mentioned, one is AWOL, one is dead, and the other two are fervent supporters of Bitcoin over BCash. Bitcoin is much more closely aligned with the original cypherpunk principles that elevate privacy and decentralization.