A common syndrome in older people, dementia is a progressive decline in memory and other mental processes that often affects the ability to function independently. As the population in the United States ages, more Americans may be concerned about their cognitive health.

In a recent article in Alzheimer's & Dementia researchers concluded that fewer Americans may be reaching a threshold of significant cognitive impairment. The scientists compared the thinking skills of 7000 people over the age of 70 who were tested in 1993 and compared them with those of a similar group tested in 2002. They found that, while 12.2% of the individuals had problems with memory or performing mental calculations in 1993, only 8.7% did in 2002. They also found that those with significant cognitive impairment had a more rapid decline to death.

Are we getting smarter? The researchers suggest that many factors, including medical, lifestyle, demographic, and social ones, have had a positive impact on the 'brain health' of older Americans. Increasing levels of education and net worth were highlighted as possible contributing factors. One hypothesis is that more extensive schooling builds up a greater cognitive reserve that can withstand the damage caused by age and illness for a longer period of time.

Despite this promising news, the number of people with dementia and Alzheimer's is still growing as the baby boomers hit 70, and the burden on individuals and families will continue to be significant. Advances in the treatment of dementia will help, but continued brain stimulation through both work and play in adulthood may help to limit the future impact of dementia. So, keep exercising your brain.