Yes; I was in college.
What do you mean by "witnessed firsthand?" As in, was in NY at the time, or just remember seeing it happen on TV? I'm from NY, but I was away at college at the time, so I was watching it on TV but had lots of friends/relatives back in the city and so I was trying to keep updated on what was going on with them.
Anyone else college aged or older when it happened? Gosh this thread is making me feel old....
I was thinking "witnessed firsthand" meant you were in the New York/DC/Shanksville area that day, and saw the destruction yourself, not just seeing it on TV.