Had doubts, and was incredibly unhappy for years. I lurked here for about 18 months and officially joined 7 years ago just as I was physically walking out the door. I was 39.
I agree, with the comment, that so many of us have left at middle age or older is because of the availability of information. In my case I would probably still be in the windowless walls of the the watchtower if it wasn’t for the net. My biggest regret was staying for as long as I did.