What is cognitive reserve? How we can protect our brains from memory loss and dementia
(PHYSorg.com Medicine & Health)

As we get older we have a greater risk of developing impairments in areas of cognitive function - such as memory, reasoning and verbal ability. We also have a greater risk of dementia, which is what we call cognitive decline that interferes with daily life. The trajectory of this cognitive decline can vary considerably from one person to the next.