I was

40 years old at the time of the 9-11 attack on America
38 years old on the first day of Y2K
36 years old when Princess Diana was killed in a car crash
34 years old at the time of Oklahoma City bombing
33 years old when O. J. Simpson was charged with murder
32 years old at the time of the 93 bombing of the World Trade Center
29 years old when Operation Desert Storm began
28 years old during the fall of the Berlin Wall
25 years old when the space shuttle Challenger exploded
23 years old when Apple introduced the Macintosh
22 years old during Sally Ride's travel in space
20 years old when Pres. Reagan was shot by John Hinckley, Jr.
18 years old at the time the Iran hostage crisis began
15 years old on the U.S.'s bicentennial Fourth of July
13 years old when President Nixon left office
11 years old when Alabama Gov. George C. Wallace was shot
8 years old at the time the first man stepped on the moon
7 years old when Martin Luther King Jr was assassinated
4 years old during the Watts riot
2 years old at the time President Kennedy was assassinated