If this were an exact science we could look at a brain scan or an x-ray and state conclusively what we were facing. Of course we can't so we argue amongst ourselves because by our very nature we are flawed, scared and insecure. We are human.
Today I am 52 years old and I am happy. It's a good age for me and while I don't physically look it (or so they tell me), I am benefiting from the wisdom and experience that I have amassed over that time.
Friday night, N bought me birthday dinner and, as I looked at the beautiful face of the woman who loves me as I am, I was very glad.