Blame Clicky.

        Who passed a comment about "his age". Clever wench saw past JK & me who didn't twig  √49   and √4900 had anything in common.
        Mine is WAY past √6400; in almost exactly 14 days It'll be √6724.  For the record, I did ask his permission and we made mock of the limitations of some modern young uns.  Well he did & I didn't contradict.