Heh. Legal age was 18 back then, nobody bothered carding people who were college age. All that aside, I think the ID is a fake, but it’s just incorrect to say “No student IDs in 1981 had bar codes.”
Age was 18 in 1978 here in Iowa as well when I started at Iowa State.
Yes I think the ID in this post/thread has been debunked more than once.