Off we skip like the most heartless things in the world, which is what children are, but so attractive; and we have an entirely selfish time, and the… - J.M. Barrie

Two is the beginning of the end.

All children, except one, grow up. They soon know that they will grow up, and the way Wendy knew was this. One day when she was two years old she was playing in a garden, and she plucked another flower and ran with it to her mother. I suppose she must have looked rather delightful, for Mrs Darling put her hand to her heart and cried, ‘Oh, why can’t you remain like this for ever!’ This was all that passed between them on the subject, but henceforth Wendy knew that she must grow up. You always know after you are two. Two is the beginning of the end.

Odd things happen to all of us on our way through life without our noticing for a time that they have happened.