If you want anecdotal counterpoints in Italy and France they make far more use of aluminum cookware than they do here in North America, in france and italy they make little use of the non stick coatings that are the norm here in the US.
Yet wonder of wonders worldwide the french have nearly the lowest incidence of Alzheimers.
Mabey because the french aren't smearing aluminum based chemicals into their armpits... like many americans do...
I'd be much more inclined to blame anti-persiprants for alzheimers than environmental exposure to aluminum.
IIRC aluminum is the third most abundant element in the earth's crust (Behind Oxygen as #1 and Silicon as #2) and THE most abundant metal, you cannot escape it, a random handful of dirt is 8% aluminum by weight.
The health scare over aluminum in regards to alzheimer's Disease
is yet another example of a little knowledge allows people to reach erroneous conclusions.