Postboys Growing Mail

Look how Rosalind Wicks recorded her son growing up next to a letterbox. In both photographs the colour of the clothes is carefully matched, right down to the sandals and socks.
I wonder, did she stop when adolescence set in - when the boy's mouth reached the same height as the mouth of the letterbox, and the two could kiss? Or is there a Rosalind Wicks postbox-postcard-take on Doisneau's 'Kiss', somewhere out there?