According to Denise Grady at the NY Times, sometimes it's best to go with the flow, in terms of dealing with symptoms of the disease.
Of course, you can keep working the brain to build reserve.
In a slide show (starting with the above image) William Utermohlen’s self-portraits reveal his descent into dementia over the span of nearly four decades. A self-portrait from 1967. Click-through to see it...