In nursing school, I was taught 80 was “retarded” and 110 was average. It’s pretty shocking they’d accept anything less than 120, but then it serves governments to keep the people stupid and their progeny even worse.
Research Confirms It: We Really Are Getting Dumber
https://science.howstuffworks.com/life/inside-the-mind/human-brain/research-confirms-it-really-are-getting-dumber.htm
IQ has been going down since 1975.