From the Lovely poem: Now we are Six, by A.A. Milne, author of the Winnie-the-Pooh stories.

When I was one,
I had just begun.
When I was two,
I was nearly new.
When I was three,
I was hardly me.
When I was four,
I was not much more.
When I was five,
I was just alive.
But now I am six,
I'm as clever as clever.
So I think I'll be six
now and forever.