When we realise we are getting old?

That's an interesting question which I have asked myself. But an article in the newspaper last day made me think about it. It was about an writer who died an year ago. He was a excelleent screen play writer. He had a lot of movies from his pen and people will always remember him.
So the author of the article was writing that " we realise that we are getting old when we find our loved ones are no more with us".