I learned to play 2e when I was 7 (13 years ago), so while it wasn't all that long ago relative to some others, I think that still counts. After getting us comfortable with that, the DM (a friend's dad) also taught us 1e to mix things up a bit, then about a year after 3e came out I moved, found a new group, and started playing that. I've played several playtest games of 4e, and have decided to stick with 3e (like others, I think it's fine on its own merits but not what I'm looking for in D&D), so I play mostly that with the occasional 2e campaign when I can convince my group to do that.