I'm certaintly an adult with a life outside the game, but my access started on the 13th of december, with a fair bit of free time over the christmas holidays, not hard to get to 50 in that time, I had some fellow WoW guild friends who started almost a week after me, and then complained at me to hurry up so they could face me in pvp (my guildies went sith, I went Jedi) as they had already reached level 50 a fair bit before myself.
I think my guild (some casual leveling guild) has around 3-4 level 50s including myself, most of them seem to enjoy the game a lot more than I do though. I loved it at the start in the early levels, but more and more I feel it misses too much of what I got used to when I used to play wow, and at the moment I'm finding it hard to get motivated to play, If anything it has motivated me to want to resubscribe to WoW, to get my fix.
I have no Idea why, to be honest.