Oh right. Plastic is a new invention.
Im post-plastic myself.
In fact, it sounds like a nice neutral PC dating system!
Instead of BC, we can use BP! Before plastic!
LOL. Apparently you never saw the movie "Mrs Robinson" where Dustin Hoffman (as a young man) was advised that the future was in plastics...and, no-one knew what plastic was. BTW, Simon & Garfunkle had a hit song after the same movie, "Mrs Robinson"