I didn’t have any issues turning forty at all. I was about to become a father for the first time, my career was going well. And I felt as well as I did when I was 25.
Fifty was a much bigger problem. I went in for a physical and was subjected to a battery of stress tests with dye for echocardiogram, because my EKG had been a little wonky and at the same time my marriage was falling apart. Getting through that year was the hardest of all.
Most of the physical issues I felt over the years have been related to self care much more than age. I felt better on my 60th than at any time since I was 18, from losing weight, exercising, and not smoking or drinking.