I've seen plenty in the rooms of AA. Yes, it is possible, and absolutely doable if someone is so inclined to do the work to get there.
One dear friend of mine has been sober since he was 19, and he's now 42 and still active in AA and NA. He says its remaining active in the programs that keeps him sober and sane. Another man I met and really liked a lot got sober in his 50's after a lifetime of drinking, and now in his 70's continues to be active in AA with a whole load of sponsees under his belt. He was in my Al-Anon group, too.