From Facebook.

Footnote: mrspdm and I had been looking after almost 6 year old great grandson for a few hours one day last week while his 3 year old sister was having minor day surgery on her thumb. Eventually it was time to reunite ggson with his mother so they could return home to Puketitiri and I was battling to secure him in his car seat so I could drive him to meet up with them.

Completely out of the blue and unprompted he said – YOU ARE OLD!!!