Very interesting. I took simvastatin for six months for high blood
pressure, cholesterol, heart attack, etc.. I stopped because I
suspected cognitive effects. Forgetting, periods of confusion, only
remembering half the details and being convinced I'd remembered them
all. In fact sometimes my brain even invented the missing details it
had forgotten in a really misguided attempt not to worry me by
admitting to the forgetting :-)

Since the cognitive problems started slowly improving after stopping
the statin I'm disinclined to risk starting it again, despite the
urging of my doc. While I was taking it, and for a few months
afterwards, I did suffer a worrying increase in frequency and size of
floaters. But since I'd always had the odd floaters come and go I
didn't associate that with the statin. Later discovering diabetes, I
put them down to that. But on reading your comment I went back and
checked my medical diary. Yup. The floaters coincided with the
statin. Hm.

Although my health has been (not surprisingly) degenerating as I
transitted from my forties into my sixties, the most important source
of degeneration has actually been the various drugs I've been given to
help with the problems. It's not so much age-related degeneration as
age-related drugs I've been sufferering from. I have a horrible
suspicion I may not be unusual in this.