So, what age do you talk to your kids about what happened on 9/11?
Because of my uncle, I think we talked with the kids briefly about it when they were younger, maybe 3rd or 4th grade. But in simplistic terms - there were really bad people who wanted to hurt america and americans, and they hurt and killed a lot of people.
I had my uncle come speak to their middle school (6-8th grades) 4 years ago and even then he didn't go into to much detail. Now that my older two boys are in HS, I fill them in with more details.