Some people look at life in the same way. We struggle through youth, and climb in our career with difficulty, but when we reach the peak of adulthood, it is all downhill after that. Physically, we begin to slowly deteriorate, and career-wise, we may get pushed aside as younger people take our place. The only question is: When do we begin "to go over the hill?" Some people say it's at 30 years old, others at 40 or 50, but more positive folks say it is even older than that.