He was born in Gjesdal as a son of farmer and petty officer Gabriel Aalgaard (1881–1973) and Berta Serine Egeland (1895–1983).

He finished his secondary education at Stavanger Cathedral School in and graduated with the cand.jur.

He chaired Sosialistisk studentlag in 1946, and was hired as a secretary in the Ministry of Foreign Affairs in the same year.

[1] From 1951 to 1956 he was a legation secretary in Vienna, changing to chargé d'affaires as Norway got an embassy in the country.

He settled at his wife's family farm in Våler, Viken in 1989, where he died in January 1995.