I was driving to work and my radio wasn't working so I had no idea. I went into the office and went to my cubical. Everyone on my floor were gathered around a cube on the far side of the office so I figured they were having a meeting. I sat down, signed into my computer and a girl named Kelly peeked her head up over my cubical and said, "OMG did you hear what happened? A plane hit the World Trade Center and the Pentagon!"
I honestly though she was playing a joke.
I was 26 at the time. But honestly, I don't feel old even though it was 15 years ago.
I'm in New Zealand and got to work and people were talking about it at 6:50am. I had not switched on the TV or heard the radio.
Beyond "America is under attack" we did not know much. I think the towers had come down by then. I think it was around midnight or 2am here when it happened.