Definition: In this task, you're given a statement, 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'.
Input: Context: he took command of the 21-gun corvette HMS Racoon from commissioning in 1863 until 1866, during which time Queen Victoria's second son, Alfred, Duke of Edinburgh (18441900) served on board as a lieutenant. Link Information: romoted to lieutenant on 24 February 1863, serving under Count Gleichen on the corvette Question: How old was Alfred, Duke of Edinburgh when he served on the HMS Racoon as a lieutenant?
Output:
Answer: 19