Being quite young still, my first game that I played personally was FFX. However, before that, I watched my brother play FFVII and FFVIII, so I guess my first experience and knowledge with the series began with FFVII. Still, FFX was the first one that I played, and since then, I've revisited FFVII and FFVIII.

Never played VI and below though. I'd very much like to play VI and IV one day.