Real Programmers stored their source code on magnetic tapes, that is if they weren't using punch cards or paper tapes. RCS, the first open source version control system, predates PKZIP by a good five years, and SCCS, the first version control system, is only a year younger than the first commercially available floppy disk drive.
But never mind that. Git was at most an incremental improvement over its direct predecessor, BitKeeper, or the other popular version control systems at the time, like Subversion. Git wasn't even unique. The open source DVCSes Arch, darcs, and Monotone all predate Git, and Mercurial was started just a few days after Git. Our hacker parents and grandparents might be old, but they aren't _savages_. ;)