Study on the relationship between age and longevity in first delivery.

Factors such as education or occupation have contributed to a significant increase in the average age at which American women have given birth for the first time in the past 40 years.
In a study published online November 17 in American Journal of Public (click to read the original text in the lower left corner), scientists at the University of California, San Diego found that women who choose to become mothers "later" (first birth) may increase their chances of reaching 90.
is the first study to investigate the relationship between age and longevity in first birth.
team found a link between the age of birth and the number of births (parity, the number of pregnancies a woman has) and the age of 90.
study surveyed about 20,000 participants, and 54 percent of women lived to be 90.
the participants were part of an international survey called women's Health Initiative.
, WHI was launched by NIH in 1991 and included three clinical trials and one observational study, recruiting more than 160,000 healthy post-menoanth women (50-79 years old), according to Wikipedia.
investigation lasted 21 years.
Aladdin Shadya, who led the study, said: "We found that women who have their first child aged 25 or over are more likely to live to 90.
women who became pregnant 2-4 times were more likely to live at least 90 years, compared to women who were pregnant only once.
, the study found that women living to 90 are more likely to be college graduates, married, have higher incomes, are less likely to be obese or have a history of chronic diseases.
Shadya said: "Pregnancy at an older age may be an indicator of good overall health.
, longevity is more likely.
may be that older women at the time of their first child have better social and economic conditions and are therefore more likely to live longer.
our study does not suggest that women should delay having children because older women are at higher risk of obstetric complications, including gestational diabetes and high blood pressure.
," he stressed.
further research will need to investigate what social factors can explain the relationship between the age of the first delivery, the number of births, and longevity.
.