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Life is limited, and needless to say, everyone knows. However, in normal circumstances, natural calamities and man-made misfortunes, everyone's life is not the same. Some people live to be more than 100, some live eighty or ninety, and others die at the age of sixty or seventy.

What determines the length of life? Who lives longer, according to the life times, a comprehensive study of several foreign countries, summed up 10 alarming signs of longevity, may wish to control to see how many you meet.

1. moderate anxiety

"Leslie middot," Martin said, "a pessimistic personality and a life prone to remorse.". On the other hand, moderate anxiety reduces the risk of death by 50% for anyone of any age. Moderate anxiety, no impulsive, no risk, life always have plans, these are the advantages of longevity.

2. normal weight

A 2011 study of 477 centenarians by the Einstein School of Medicine found that the lifestyle of these older people was no healthier than the rest of the elderly, and the only difference was that few of them were obese.

The 3. chromosome has a long telomere

Telomeres are protective DNA sequences at the ends of chromosomes, and the longer the telomeres, the longer the cell age takes place and the longer the lifespan.

Some researchers believe that, remove the pressure, stop smoking, eat rich in Omega 3 fatty acids in foods such as fish, can increase the telomere length, but the centenarians are induced by telomere gene.

3., life is full of hope

A long-term study at the Stanford University shows that positive emotions determine life more than attitudes. The researchers say, full of hope that the less pressure of life, which in turn affect the levels of the stress hormone cortisol, and improve health.

4., many longevity in the family

The Boston University School of medicine called the survey found new England Centenarian Study ", Banshubai year old family, have parents, siblings or grandparents live past the age of 90.

5. walking is fast and far

Researchers at the University of Pittsburgh in the United States, who studied 35 thousand people over the age of 65, found that walking speed increased by 0.1 meters per second, and the risk of death dropped by 12%.

In 2006, the Journal of the American Federation of Medical Sciences reported that among 70 to 79 year old people, the elderly who could not walk 400 meters may have no more than 6 years of life, and their chances of disability were greater.

6., social life is very rich

Middot Martin, a professor of psychology at the United States, says that women with religious beliefs live longer because religion promotes their social lives. He says people who have close social events with family, friends and colleagues also live longer.

7. women live longer than men

In 2010, the United States 8 million centenarians, 85% women. Scientists speculate that a lower risk of heart disease in women, higher rates of smoking among men and a high rate of accidents may be a factor in the phenomenon. But the good news is that male centenarians are generally healthier than women centenarians, and they are not susceptible to disability.

8.35 years old child

The new England Centennial study found that women born after age 40 are 4 times more likely to live to 100 than other women. After 35 years of age, natural childbirth also leads to longer life. Scientists believe that childbirth may explain the reproductive system of aging is slow, the rest of the body may have similar.

9. year of birth affects life

In 2011 the British government released a report, 2011 born boys and girls at the age of 100 probability were 1/4 and 1/3; 2011 to men and women at the age of 20 at the age of 100 the probability is 19.5% and 26.6%; 50 men and women aged 14.6% and 10% respectively.