Maybe around 9 or 10?
I was thinking about religion, and I just kept thinking, not everyone even gets a chance to hear this shit, do they get to go to heaven? If a new born baby dies, what happens to it? And does it age? Is it stuck as a baby forever in the afterlife?
What if I died when I was really old, would I be stuck as a senile old crazy person for eternity? And what if my mind was cleansed of all problems, what kind of problems? Because my faults make me, well, me, and I don't want some deity fucking with them. I eventually came to the conclusion that I should wait till I think I'm at my mental peak, and off myself. But, everybody says not to do that, and what if all this afterlife stuff isn't real anyway? I'd have ended myself for no good reason, wouldn't I?
That said, what if future me is a dick, and dies, I'd be stuck like that forever! I ended up deciding that there wasn't an afterlife, because there's no way it would work. That still depresses me.