This isn't evidence, this is marketing and anecdotes.
That’s what I run into with my doc. “You seem sharp to me”. Yeah, I’m a resonably smart guy, but could I be better if I skip these? Slowdown may not be apparent to others, but it is to me.
Probably not? It'd be pretty unusual for an already sharp person to become sharper at age 80.
Two well-done meta-analyses of statins for primary prevention showed no mortality benefit. After the exclusion of four trials with serious risks of bias, the relative risk of cardiovascular events associated with statins was 0.99 (95% confidence interval, 0.90 to 1.08).2,3
Now, as for mental health, the FDA has added no warnings despite decades of use, and the mechanism of action strongly suggests statins would be protective if anything (by directly and significantly reducing vascular dementia). Here's a package insert from the FDA's website: https://www.accessdata.fda.gov/drugsatfda_docs/label/2012/02...
Also, I'm not raging statin advocate, the real answer is diet and exercise. The American lifestyle is a catastrophe.
I can find confirmations and denials of literally any concept in the universe on google.
This is more a general rule when discussing medicine, not so much a denial of this specific drug.