"When I was 20, I knew that 75 was old," says the gray-haired man in the uniform of a 17th Civil Engineer Squadron civilian. "When I was 30, 40, 50, I knew that 75 was old. So I'm an old man," he says, and then pauses. A grin crosses his face. "I don't feel 75." Whether he felt it or not, Don Hedges