32 years in Parliament (most of them spent as either a cabinet minister or opposition frontbencher), a combined 25 years as leader of the non-Labor Coalition, and 38 years as an elected official. To date, Menzies is the last Australian prime minister to leave office on his or her own terms. He was succeeded as Liberal Party leader and prime minister by his former treasurer, Harold Holt. He left office at the age of 71 years, 1 month and 6 days, making him the oldest person ever to be prime minister. Although the coalition remained in power for almost another seven years (until the 1972 Federal election), it did so under four different prime ministers, largely due to his successor's death, only 22 months after taking office. On his retirement he became the thirteenth chancellor of the University of Melbourne and remained the head of the university from March 1967 until March 1972. Much earlier, in 1942, he had received the first honorary degree of Doctor of Laws of Melbourne University. His responsibility for the revival and growth of university life in Australia was widely acknowledged by the award of honorary degrees in the Universities of Queensland, Adelaide, Tasmania, New South Wales, and the Australian National University and by thirteen universities in Canada, the United States and Britain, including Oxford and Cambridge. Many learned institutions, including the Royal College of Surgeons (Hon. FRCS) and the Royal Australasian College of Physicians (Hon. FRACP), elected him to Honorary Fellowships, and the Australian Academy of Science, for which he supported its establishment in 1954, made him a fellow (FAAS) in 1958. On 7 October 1965, Menzies was installed as the ceremonial office of Lord Warden of the Cinque Ports and Constable of Dover Castle as appointed by the Queen, which included an official residence at Walmer Castle during his annual visits to Britain. At the end of 1966 Menzies took up a scholar-in-residence position at the University of Virginia. He presented a series of lectures, published the following year as Central Power in the Australian Commonwealth. He later published two volumes of memoirs. In March 1967 he was elected Chancellor of Melbourne University, serving a five-year term. In 1971, Menzies suffered a severe stroke and was permanently paralysed on one side of his body for the remainder of his life. He suffered a second stroke in 1972. His official biographer, Lady McNicoll wrote