The Pew Research Center defines " Post-Millennials " as born from 1997 onward , choosing this date for " key political , economic and social factors " , including September 11th terrorist attacks . This date makes Post-Millennials four years of age or younger at the time of the attacks , so having little or no memory of the event . Pew indicated they would use 1997 – 2012 for future publications but would remain open to date recalibration
September 11th terrorist attacks
September 11 attacks
Generation Z