Like Mamyalynne pinted out - I think this 'survey' is a fairly shallow bit of journo hacking. Noticeably missing: 'teenager'; 'vandal' to name just two.
Shoddy stuff, recommend it is treated with contempt.
it's not a survey at all, Mosaic, just a fairly random list compiled by the OED people with no attempt to be comprehensive, though it appears you can search for other words from your birth year.
Agree with Mamya, bagsy's much older (though in my neck of the woods it was just bags). And "Braniac" (tut tut OED, it should be Brainiac, call yourself a dictionary) is way before 1975 - he was fighting Superman in 1958