Living to the ripe old age of 90 may depend on your body size -- both height and weight -- as well as your level of physical activity, and seems to influence a woman's lifespan more than it does a man's, according to a new study published Monday in the medical journal BMJ.

A large, longitudinal study

The groups were monitored until they died or reached the age of 90; of the 7807 participants, 433 men and 994 women lived to that age. Issues that could affect longevity, such current or past smoking and level of alcohol use, were also taken into account.

Men and women in the study fared very differently when it came to the impact of body size and exercise.

Women who weighed less at age 20 and put on less weight as they aged were more likely to live longer than heavier women. Height played a major factor: the study found women who were taller than 5 feet 9 inches were 31% more likely to live into their 90s than women who were less than 5 feet 3 inches.

Neither height or weight seemed to factor into whether the men reached their 90s, but activity level did. Men who spent 90 minutes a day or more being active were 39% more likely to live to 90 than men who were physically active for less than 30 minutes. In addition, for each 30 minutes a day the men were active, they were 5% more likely to reach that age.

However, women who were physically active for more than 60 minutes a day were only 21% more likely to live to 90 than those who did 30 minutes or less. And unlike men, there was no bonus for increasing activity. In fact, the study found that the optimal level of activity for women was 60 minutes a day.

Average life expectancy has been increasing for most of the world, but recent studies show a slowing of that trend in some developed nations. In the US for example, life expectancy has been declining over the last few years. Drug overdoses and suicides are to blame for the most recent decline, according to the Centers for Disease Control and Prevention, but the major causes of death remain the same. Heart disease, cancer, and stroke, three of the top killers of Americans, are all affected by weight gain and a lack of exercise.

"It is now very clear that overweight, obesity and sedentary lifestyles are harmful to health," Carslake said. "Studies like this one, which examine the shape of the associations, and ask whether they are the same in different groups...will be increasingly important."

EurasiaDiary © Must be hyperlinked when used.