Me four! I was also late to the Civ party. I think the first one I played was 4. Might have bought 3 somewhere along the line, but didn’t play it until much later.
Slightly off-topic, LGR did a retrospective on Sims 1 after many years. He concluded that while it was revolutionary for the time, it’s simply too limited to be much fun now. I wonder if Civ will feel the same way, after we’ve been spoiled by the later games. Or maybe the basicness that Tijn describes above will hold up well.