I'm just the messenger and haven't studied this yet. I don't have access to the full paper anyway.
The Buck Institute posted this link:
Article in LA Times: http://touch.latimes.com/#section/-1/article/p2p-82954019/
Changes Linked to Alzheimer's Evident Even in Young Brains
Link to abstract in the journal Brain: http://brain.oxfordjournals.org/content/early/2015/02/26/brain.awv024
Neuronal amyloid-β accumulation within cholinergic basal forebrain in ageing and Alzheimer’s disease