With God and sex, I'm finding my child seems satisfied with very simple but truthful answers. I will admit when he asks me about God, I'm tempted to ask him if he'd prefer to discuss sex
The facts of life are a bit more cut and dry.
He has also been at two wakes, including my Mother's. It has not damaged him and we've had short discussions about it. I realize, though, that some kids are more sensitive to this topic. We also have an old dog and I've tried to prepare him a bit for the inevitable.
I do not think there is one set age to decide how much info a child deserves.