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This is Part 3 on how lifestyle influences aging. Many recent research reports tell of a link between our lifestyle and how we'll age - whether we'll be active and healthy well into our 80s or in terrible shape and dying young. Mind you, these are not "definites" because nothing can give you a guarantee, but they are ways we can improve our odds in living a long and healthy life. From Medical Xpress:

Having a sense of purpose may add years to your life, study finds

Feeling that you have a sense of purpose in life may help you live longer, no matter what your age, according to new research. The research has clear implications for promoting positive aging and adult development, says the lead researcher.

The researchers looked at data from over 6000 participants, focusing on their self-reported purpose in life (e.g., "Some people wander aimlessly through life, but I am not one of them") and other psychosocial variables that gauged their positive relations with others and their experience of positive and negative emotions.

Greater purpose in life consistently predicted lower  across the lifespan, showing the same benefit for younger, middle-aged, and older participants across the follow-up period. "To show that purpose predicts longer lives for younger and older adults alike is pretty interesting, and underscores the power of the construct," he explains.

From Science Daily:

Education boosts brain function long after school, study shows

Education significantly improves mental functioning in seniors even four decades after finishing school, shows a new study. The study shows that people who attended school for longer periods performed better in terms of cognitive functioning than those who did not. Using data from individuals aged around 60, the researchers found a positive impact of schooling on memory scores. The fact that young people or their parents did not choose whether to go longer to school strongly suggests that schooling is the cause rather than personal characteristics that would affect this choice and could also explain the differences in cognitive function.

From Medscape:

Lifetime of Intellectual Enrichment Keeps Aging Brain Sharp

A lifetime of intellectual enrichment helps delay onset of cognitive decline in older individuals, new data from the Mayo Clinic Study on Aging show.

In this longitudinal study, researchers found ties between higher levels of education and working in mentally stimulating jobs in early- to mid-life, as well as higher levels of mid- to late-life cognitive activity, such as using a computer, reading, and participating in social activities, and better cognition with age..."We also found that an individual with low education/occupation benefited more by engaging in high mid-/late-life cognitive activity than an individual with high education/occupation," Dr. Vemuri noted.

A number of research results were reported at the Alzheimer's Association International Conference 2014.  From Science Daily:

Potential Alzheimer's disease risk factor and risk reduction strategies become clearer

Participation in activities that promote mental activity, and moderate physical activity in middle age, may help protect against the development of Alzheimer's disease and dementia in later life, according to new research.

From Science Daily:

Physical activity is beneficial for late-life cognition

Physical activity in midlife seems to protect from dementia in old age, according to a study. Those who engaged in physical activity at least twice a week had a lower risk of dementia than those who were less active. The protective effects were particularly strong among overweight individuals. In addition, the results showed that becoming more physically active after midlife may also contribute to lowering dementia risk.