Possible Clues:

• Teasing rubbish that is about moaner
• Playful banter inappropriate during one's twilight years
• Banter, they say, is not good when you're old
• That's the sort of talk you'd expect from a dirty old man
• Beg Diana with good-humoured teasing
• Friendly teasing
• Chaff is harmful when it's old
• Beg Diana for light banter
• Mark engaging in a witty conversation
• Frivolous talk getting serious in time