In this task, you're given a passage, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.

Passage: Born on 25 June 1884 in South Kensington, England, the eldest child of Henry Neville Custance and Alice Georgina, née Custance. His grandfather was Admiral Sir Reginald Custance. He joined the Royal Navy on 15 January 1899 as a cadet. He was rated midshipman on 15 May 1900 and served aboard HMS Ocean. Promoted to sub-lieutenant on 15 July 1903 he served aboard HMS Foam in the Mediterranean Station between 1904–1905. He served upon HMS Venerable in 1905 and promoted to lieutenant on 15 January 1905. He was the Gunnery Officer aboard HMS Vanguard between 1913–1917, and was having dinner aboard another ship at Scapa Flow in 1917 when HMS Vanguard suffered an internal explosion and sank with the loss of lives of 843 men. He served aboard HMS Vanguard during World War I and was present during the battle of Jutland in 1916.
 Link Information: His grandfather was Admiral Question: What is the age difference between Wilfred and his grandfather?
Answer: 37

Passage: Robert Hues (1553 – 24 May 1632) was an English mathematician and geographer. He attended St. Mary Hall at Oxford, and graduated in 1578. Hues became interested in geography and mathematics, and studied navigation at a school set up by Walter Raleigh. During a trip to Newfoundland, he made observations which caused him to doubt the accepted published values for variations of the compass. Between 1586 and 1588, Hues travelled with Thomas Cavendish on a circumnavigation of the globe, performing astronomical observations and taking the latitudes of places they visited. Beginning in August 1591, Hues and Cavendish again set out on another circumnavigation of the globe. During the voyage, Hues made astronomical observations in the South Atlantic, and continued his observations of the variation of the compass at various latitudes and at the Equator. Cavendish died on the journey in 1592, and Hues returned to England the following year.
 Link Information: St Mary Hall was an academic hall of the University of Oxford Question: In which country did Hue attend college?
Answer: England

Passage: Thomas Bonham had been admitted to St John's College, Cambridge, in 1581. Earning a bachelor's degree in 1584, he completed a master's by 1588 and studied for a medical doctorate at Cambridge, which was later granted by the University of Oxford. By 1602, he had completed his studies and moved to London, where he practised medicine and associated himself with the Barber-Surgeons' Company, campaigning for it to be allowed to authorise medical practitioners in a similar way to the College of Physicians. Apparently giving up after a failed petition to Parliament in 1605, Bonham petitioned to join the college on 6 December 1605 but was rejected and told to return after further study. Returning on 14 April 1606, he was again told he could not join and was fined £5 () and threatened with imprisonment for continuing to practise. Bonham still kept working as a doctor; on 3 October it was announced he was to be arrested and fined £10. Bonham again appeared before the college, now with a lawyer, on 7 November. He announced that he would continue to practise without seeking the college's permission, which he claimed had no power over graduates of Oxford or Cambridge. He was then imprisoned (some say at Fleet Prison, and some say at Newgate Prison) for contempt, but his lawyer had a writ of habeas corpus, issued by the Court of Common Pleas, which freed him on 13 November.
 Link Information: Thomas Bonham M.D. (c. 1564c. Question: At what age did Bonham earn his master's?

Answer: 24