"Dementia" is a loaded word, one that carries with it the baggage of hundreds of years of gross associations and misunderstanding of the reality of the person living with the illness.
Many of my baby boomer patients notice that from time to time they forget things like a name, face or where they put their keys. Is this normal, they wonder? Or, as many of them ask, "Is this a sign of Alzheimer's?"
Where is the line between age related memory loss and early Alzheimer's disease? We have a name for this transitional phase, it is called, Mild Cognitive Impairment or MCI.
Substantial gains could be achieved by organizing everyday activities that grow neurological abilities and sustain brain health. If the ordinary citizen is to achieve brain fitness, they'll need to work at it.