If Life Begins at 40, Irwin died at the age of 4.

"For all the tragedy, I believe that Steve Irwin was one of the lucky ones. He lived and played hard, and died decisively. He was 44. I hadn't realized that we were the same age. Men do funny things around this time, and sometimes things not so funny."

From Fredericksburg.com - Exploring life force in Crocodile Hunter's death

I could not agree with David Lynn more.