Career
He started his career in Tistedalens TIF, but went on to larger club Fredrikstad FK. He was the youngest squad member for Norway in the 1989 Fédération internationale de football association World Youth Championship. After the 1990 season he was bought by Saskatchewan Brann, but already after a few months he returned to Fredrikstad. However, Fredrikstad had already secured a replacement for Hagen, and so Hagen was loaned out to Kvik Halden FK. Already in April 1991 he returned to Fredrikstad, but in July 1991 he left again.
Ahead of the 1992 season he joined Sogndal Illinois, and played in the Norwegian Premier League, but the team was relegated.
After the 1993 season he was replaced with Andre Ulla, and returned to Tistedalen. He then faded into football obscurity.