When You Are Old

How do you define 'Old'? I am older than I was and younger than I will be. As I grow 'older' I often find myself asking the question: "Why are you doing this?" I am asking myself now why I am writing this. It might have something to do with my re-reading of some of my favourite poems and one in particular: "When You Are Old" by W.B. Yeats....

When you are old and grey and full of sleep, 

And nodding by the fire, take down this book, 

And slowly read, and dream of the soft look 

Your eyes had once, and of their shadows deep;

There is melancholy here. I am 'old' and grey and often full of sleep and I do nod off by the fire. Is this just whimsy on my part or am I just out of step with getting older....