Population wise, that was the case for a number of years after 9/11. In terms of government policy, it's still the case. But in terms of the former, it's fading away as more time passes. People who were born in 2001 are or will turn 20 this year. Just like events like the attack on pearl harbor and the Cuban missle crises, 9/11 will also become an event that's just known by reading history rather than a first hand experience.