We estimated lifetime prevalence of psychedelic use (lysergic acid diethylamide (LSD), psilocybin (magic mushrooms), mescaline, and peyote) by age category using data from a 2010 US population survey of 57,873 individuals aged 12 years and older. There were approximately 32 million lifetime psychedelic users in the US in 2010; including 17% of people aged 21 to 64 years (22% of males and 12% of females). Rate of lifetime psychedelic use was greatest among people aged 30 to 34 (total 20%, including 26% of males and 15% of females).
Makes sense. I am 30, and when I was in high school acid and mushrooms were everywhere. Never came across peyote, although I did see what they called mescaline (the active chemical in peyote) a time or two, but I think was probably LSD dissolved onto some other substrate to make it look fancier (and so the dealer could charge more). Students would be wise to get back on the acid/'shrooms and off all the silly pills they pop nowadays. 8 hours of mind altering, harmless fun for $5. What could be better?