He was a master mariner, and subsequently became engaged in mercantile pursuits. Gage was the Chairman of the Augusta, Massachusetts, Board of Selectmen, in 1803. He served as member of the Massachusetts House of Representatives, and served in the Massachusetts State Senate.
He was a maritime expert, and subsequently pursued commercial opportunities. Gage served as chairman of the Augusta, Massachusetts, town council in 1803. He represented the people of Massachusetts in various legislative capacities, including the state house and senate.