I figured it out in my 50's tho I had serious doubts and questions from my early 20's. Both my parents had doubts before they died....but they both said 'it is still the truth'.....my Dad blew raspberries when I asked him what he thought about 1914 (this was well before the over-lapping generation excuse). My Mom called not celebrating birthdays and holidays ' a load of crap'....so they knew, but for whatever their reasons, they hung on.
I've been a fader, and have faded so deep that I'm nearly invisible. Haven't managed much of a social life rebuild, but still happy to not be wading chin deep in bull manure.