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: Chafee was the only Republican in the Senate to vote against authorization of the use of force in Iraq in the lead-up to the Iraq War. He was defeated in his 2006 reelection bid by Democrat Sheldon Whitehouse. Chafee subsequently shifted his affiliation towards the Democratic Party by first endorsing Barack Obama in the 2008 presidential election, running as an independent for Governor of Rhode Island in 2010, serving as the co-chair of Obama's 2012 re-election campaign, and then finally officially switching his registration to the Democratic Party in May 2013. In 2015, he sought nomination to be the Democratic Party candidate in the 2016 presidential election, but withdrew prior to the primaries and later endorsed Hillary Clinton. In 2019, Chafee expressed interest in running in the Libertarian primary for President in the 2020 election.
Link Information: He was defeated in his 2006 reelection bid by Democrat Sheldon Whitehouse Question: How old was Whitehouse when he defeated Chafee?
Answer: 51