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: At the 2010 Wimbledon Championships, he played the longest professional tennis match in history, defeating Nicolas Mahut in a total of 11 hours and 5 minutes, played over the course of three days. Link Information: Mahut had excellent junior results, winning the Orange Bowl in 1999 and the Wimbledon Boys' Singles in 2000, turning professional the same year Question: How old was Mahut when he started playing professional tennis?
Output:
Answer: 18