BARNEY CALMAN: What does it mean to die of old age? It’s a familiar phrase, and yet, when it emerged that it was the cause of death on the Queen’s death certificate, many expressed surprise.BARNEY CALMAN: What does it mean to die of old age? It’s a familiar phrase, and yet, when it emerged that it was the cause of death on the Queen’s death certificate, many expressed surprise.Read MoreHealth News | Mail Online