Answer by Thomas Zerbarini:
Turning 40 wasn't bad at all. I did notice the weight was harder to lose and the blood pressure was creeping up. Other than that it was a piece of cake.
I did have my third child at 40 and my fourth child at 42. Those events were more challenging to adjust to that turning 40.
It really comes down to what you make of your life events and how you want to feel about them. It really is our choice on how we feel or allow things to effect/control our emotions.