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 skilled sailor, and subsequently turned to commercial endeavors. Gage held the position of chairman in the Augusta, Massachusetts, town council in 1803. He served as a member of the Massachusetts state legislature and also sat in the Massachusetts state senate.