ChangingAging.org compiled some noteworthy resources, including the Alzheimer's Association.
They also recommend The Myth of Alzheimers:
"Perhaps the most profound website challenging the conventions of Alzheimer’s disease is TheMythofAlzheimers.com — “What you aren’t being told about today’s most dreaded diagnosis.”
The Myth of Alzheimer’s is a bold and direct challenge to the multi-billion dollar juggernaut that is the status quo of Alzheimer’s thinking, marketing and research. It’s an alternative approach seeking to humanize the way we think about brain aging and strengthen the care and solidarity provided to people affected by memory loss."