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'.
Q: Context: Kirby's great grandfather Charles Kirby (1805–1870) Link Information: Kirby's great grandfather Charles Kirby (1805–1870)  Question: How old was Cam Kirby's great grandfather when the American civil war ended?
A: 
Answer: 60