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?
Interesting question.
Being born in 1990, the first political event I can vaguely remember anything from was the 1994 EU referendum in my country. But that's an 'outlier' though - other than that I can't remember any political/world event from until I was 7-8 years old.