If you don’t know me by now

A twenty-strong lunch club from Stretton Sugwas came on Wednesday for our ham and quiche salads.
I was offering them tea or coffee as they finished eating.
“I do like tea,” said a gentleman at the end of the table, “but on this occasion I’d like coffee.” Then he added, “my wife will also have coffee,” and he gestured to a lady seated a couple of places away.
She told him that, actually, she would like tea.
He looked surprised.
“You don’t know her at all, do you?” I joked, “how long have you been married?”
“Sixty two years,” he said.
It must take sixty three.