Splitting the 3 youngest cohorts during 9/11 into 3.
Earlier 90s borns (1990-1994): The last off cusp millennials. This cohort was probably starting middle or elementary school around the day towers fell. Oldest was probably in 6th grade while the youngest was in 1st grade or kindergarten. Would likely have clear memories of the event.
Later 90s borns (1995-1999): The inbetweeners. The oldest in this cohort was probably in kindergarten when the towers fell and the youngest were toddlers in pre-school who were just learning how to talk and form their first sentences.
Earlier first half 2000s borns (2000-2004): Most born post 9/11, oldest in this cohort was only 1 year old or less at most when the towers fell, just toddlers with no strong memories of the event at all of the event. The rest born between September 2001-2004 weren’t even alive for the event. The first off cusp Gen Z cohort. The oldest ones born in 2000-2001 were probably newborns or toddlers who hadn’t even said their first words yet.
Edit: This was supposed to be a draft, might delete later