Memory lane: Older persons with more schooling spend fewer years with cognitive loss

Those with high school education live 2.5 years more without mental impairment, study finds

Those with at least a high school education spend more of their older years without cognitive loss – including the effects of Alzheimer’s, Parkinson’s and dementia -- but die sooner after the loss becomes apparent, reveals a new study appearing in the June 2008 issue of the Journal of Aging and Health.

“These findings are consistent with the idea that those with more education may process tasks more efficiently or use other compensatory mechanisms that delay cognitive impairment or delay our ability to detect impairment,” explained USC Davis School of Gerontology professor Eileen Crimmins, corresponding author of the study.

Using a nationally representative survey, Crimmins and her co-authors tracked more than 7,000 people over the age of 70 for seven years. They found that a 70-year old person with at least 12 years of education can expect:

• To live 14.1 more years without cognitive impairment, two-and-a-half years more than 70-year olds with fewer than 12 years of education.
  
  
• To spend 1 year of remaining life with impairment, about 7 months less than a person with fewer years of education.
  
  

“One implication of these findings is that as education increases in the population, the length of time spent with cognitive impairment should be reduced,” Crimmins said.

However, those with more education appeared to exhibit more severe cognitive impairment — which may include memory loss, loss of language or disorientation — and to be in worse health, the researchers found.

“Surprisingly, the risk of dying among those with cognitive impairment is generally higher for the more educated than for the low education group, even though the possibility of becoming cognitively impaired is lower for the higher education group,” Crimmins said.