Since he is Norwegian, I guess he doesn’t worry about the IRS, NSA, or any other American alphabet soup department. His being 86, means he probably would give a flying you know what even if he were American.
Well he IS an American Citizen (resident 1958, Citizen since 1964) and did the work leading to his share of the 1973 Physics Nobel Prize while working for General Electric in the 1960s. As for age 86, I fully agree!