Born in the Lower East Side of Manhattan, New York, on 11 February 1919, Walton spent his early life there, joining the Army in March 1941. He served during World War Two, being discharged at the rank of corporal.
He became a geology teacher, having studied at Yale University graduate school, teaching at Duke University and North Carolina State University, and married school teacher Rena Bell in 1954. He later had a civilian job at the United States Air Force base in Maine, and one at the NAS North Island in San Diego after having moved there in 1960.
In April 2018, he set out on a "No Regrets" tour with the goal of meeting the President of the United States and the Governors of all 50 states. By July 2019, he had met 23 governors and President Donald Trump.
- Himchak, Elizabeth Marie (13 March 2019). "Rancho Bernardo centenarian is taking a 'No Regrets' tour". San Diego Union Tribune.
- Rosato Jr, Joe (31 July 2019). "World War II Veteran's Tour Meets Up With California Governor". NBC Bay Area. NBC Universal.
- Ruane, Michael E. (30 May 2019). "Sidney Walton has been traveling the country to represent his passing generation". the Washington Post.
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