Aas was the number two speed skater in Norway through the entire 1950s—initially after Hjalmar Andersen, later after Knut Johannesen. Aas participated in all international championships between 1951 and 1960, almost always finishing in the top ten. Aas also was a successful cyclist, winning the 1956 Norwegian Championships in both road cycling and track cycling.
Until 1956, Aas represented Oslo Idrettslag (Oslo Sports Club) – from 1957 on, he represented Oslo Skøiteklub (Oslo Skating Club).
When he ended his skating career, he became a coach at Oslo Skøiteklub. To put these personal records in perspective, the WR column lists the official world records on the dates that Aas skated his personal records.
Aas has an Adelskalender score of 185.337 points. His highest ranking on the Adelskalender was a thirteenth place.