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Posted: February 26, 2008

You Might Live to 90 by Changing Your Lifestyle 5 Ways: Report

A healthy lifestyle during the early elderly years -- including weight management, exercising regularly and not smoking -- may increase your chances of living to age 90, as well as enjoying good health and physical function along the way, according to a report in the journal Archives of Internal Medicine. While the benefit exists for both sexes, it is especially true for men.
 
Studies of twins have found that about one quarter of the difference in human life span can be attributed to genetics, according to background information in the journal article. That leaves about 75% that could be influenced by modifying certain risk factors.
 
Dr. Laurel B. Yates, of Brigham and Women’s Hospital in Boston, and colleagues studied a group of 2,357 men who were participants in the Physician’s Health Study. At the beginning of the study, in 1981 to 1984, the men -- with an average age of 72 -- provided information about demographic and health variables, including height, weight, blood pressure and cholesterol levels and how often they exercised. Twice during the first year, and then once each following year through 2006, they completed a questionnaire asking about changes in habits, health status or ability to do daily tasks.
 
A total of 970 men (41%) lived to age 90 or older. Several controllable biological and behavioral factors were associated with survival to this exceptional age. “Smoking, diabetes, obesity and hypertension significantly reduced the likelihood of a 90-year life span, while regular vigorous exercise substantially improved it,” the authors write. “Furthermore, men with a life span of 90 or more years also had better physical function, mental well-being, and self-perceived health in late life compared with men who died at a younger age. Adverse factors associated with reduced longevity -- smoking, obesity and sedentary lifestyle -- also were significantly associated with poorer functional status in elderly years.”
 
The researchers estimated that a 70-year-old man who did not smoke and had normal blood pressure and weight, no diabetes and exercised two to four times per week had a 54% chance of living to age 90. However, if he had adverse factors, his likelihood of living to age 90 was reduced to the following amounts:
“Although the impact of certain midlife mortality [death] risks in elderly years is controversial, our study suggests that many remain important, at least among men,” the authors wrote. “Thus, our results suggest that healthy lifestyle and risk management should be continued in elderly years to reduce mortality and disability.”
 
In the second study, Dr. Dellara F. Terry, of the Boston University School of Medicine and Boston Medical Center, and colleagues studied 523 women and 216 men age 97 or older. These centenarians completed questionnaires about their health history and functional ability by mail or telephone. Participants were split into groups based on sex and the age at which they developed diseases typically associated with aging: chronic obstructive pulmonary disease, dementia, diabetes, heart disease, hypertension, osteoporosis, Parkinson’s disease and stroke. Those who developed these conditions at age 85 or older were classified as delayers, whereas those who developed them at a younger age were termed survivors.
 
Of the participants, 32% were survivors and 68% were delayers -- “thus, morbidity [illness] was not compressed toward the end of these exceptionally long life spans,” the authors write. “Yet, centenarians who had developed heart disease and/or hypertension before age 85 years and still survived to 100 years demonstrated similar levels of function (‘independent’ in the case of men and ‘requires minimal assistance’ in the case of women) as those who delayed morbidity until after age 85 years.”
 
Though fewer men than women survive to extremely old age, the male centenarians in this study appeared to have better mental and physical function than their female counterparts. “One explanation for this may be that men must be in excellent health and/or functionally independent to achieve such extreme old age,” the authors write. “Women on the other hand may be better physically and socially adept at living with chronic and often disabling health conditions.”
 
The results regarding the timing of illness in centenarians “may shed additional light on the various ways in which people can survive to extreme old age,” the authors conclude. “Determining the mechanisms that facilitate the delay or escape of disability in the face of clinically evident age- and mortality-associated morbidities merits further investigation.”

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