 Macmillan died at Birch Grove, the Macmillan family mansion on the edge of Ashdown Forest near Chelwood Gate in East Sussex, four days after Christmas in 1986.His age was 92 years and 322 days—the greatest age attained by a British Prime Minister until surpassed by Lord Callaghan on 14 February 2005.His grandson and heir Alexander, Viscount Macmillan of Ovenden, said