Sir, – Jack Benny famously used it for comic effect, but at 39 years old both Lionel Messi and Novak Djokovic have shown age is no impediment to sporting greatness. A late-late Messi-inspired comeback by Argentina saw them overcome a two-goal deficit against Egypt, while the longest quarter-final in Wimbledon history, at five-and-a-quarter hours, saw Djokovic beat an opponent 14 years his junior. Two overlapping monumental events on the same evening – sport doesn’t get any better. – Yours, etc, BRIAN ROBINSON, Daingean, Co Offaly.