At what age did you become an atheist/agnostic? And what brought that about?

[beveeheart]

41. Watching my grandfather watch Oral Roberts

save people on a small tv screen when I was about 10 years old in the 50's.
My grandfather was an old-timey Methodist - no drinking ( I actually found his Temperance membership card after he died), no playing card games including solitaire on Sundays, also no real cooking on Sundays just heat up what had been prepared for the Sunday meal from the day before. When my sister and I spent a couple of weeks with him in the summers, he took us to tent revival meetings which I found hilarious with people rushing to the preachers to be blessed and saved from their sins. My grandfather was one of those people and I never understood why he would do that because he was a very good hard-working man, much beloved by his family and his community.