age gap noun1 •A difference in ages between two or more people, especially in the context of romantic or sexual relationships.In the same episode, 39-year-old Matt Smith’s character of Daemon Targaryen takes part in an incest scene with his niece Rhaenyra, played by 22-year-old actor Milly Alcock – an age gap of 17 years. — 2022 formsage gaps