Yes, of course I remember it.
Serious question: How young would a kid have been (on average) on 9/11 for them not to remember it 15 years later? I have some fragmentary memories of when I was 3, but that was of course family stuff, as I didn't know anything about world events back then. Would someone who was 6 on 9/11 have been aware of it, or been able to remember the day years later? Where's the cutoff?
I have fragmentary memory from the time of the first Gulf War, when I was two and a half (it was on TV all time).
It's frequently accepted that kids develop regular memory around 5, and before that there are random fragments. There's at least two more such random fragments I can recall when I was 2-3.