Link to November 7 Appleton Post-Crescent article, "Marc Trager the fifth Republican candidate seeking to oppose U.S. Rep. Steve Kagen".
"Served as a major in the Air Force" is the only information about Trager, age not given, the article provides. (According to treehugger blog, Trager is a Howard physician.)
The other 4 candidates include:
Reid Ribble, 53, Kaukauna roofing contractor.
Marc Savard, 47, an organic farmer and Door County Board member
Andy Williams, 41, a lawyer and Brown County Board member
Kerry Thomas, 44, of Sayner in Vilas County. (Not his first try.)