A new study has found that women have better brainpower after menopause if they had their last baby after age 35, used hormonal contraceptives for more than 10 years or began their menstrual cycle before turning 13.
This is the first study to investigate the association between age at last pregnancy, which can be a marker of a later surge of pregnancy-related hormones, and cognitive function in later life.
“Based on the findings, we would certainly not recommend that women wait until they’re 35 to close their family, but the study provides strong evidence that there is a positive association between later age at last pregnancy and late-life cognition.”
Postmenopausal women who had their last pregnancy after 35 had better verbal memory.
Those who had their first pregnancy when they were 24 or older had significantly better executive function, which includes attention control, working memory, reasoning and problem solving.
The main hormones at play are estrogen and progesterone.
In animal studies, estrogen has a beneficial impact on brain chemistry, function and structure; progesterone is linked with growth and development of brain tissue, a researcher said.
The study, published in the Journal of the American Geriatrics Society, includes 830 women who, on average, were 60 years old. The data was adjusted for age, race and ethnicity, income, and education.
Participants were given a series of tests that included assessments of verbal memory (remembering a list of words or retelling a story after some distraction), psychomotor speed, attention and concentration, planning, visual perception, and memory.
Previous research has shown that many women experience brainpower and memory declines in their postmenopausal years.
An outpouring of estrogen and progesterone, especially in later life, appears to be beneficial.
In addition, the study found that other reproductive events were also important to later life cognition. More time between first and last period — longer reproductive life — proved valuable for executive function.
Use of the pill or other hormonal contraceptives for at least 10 years was beneficial for verbal memory and critical thinking ability.
Women who didn’t carry their pregnancy to term and those who gave birth to two children had better overall cognitive ability, verbal memory and executive function when compared to women who had only one full-term pregnancy.
Citation: Karim R, et al. (2016). Effect of Reproductive History and Exogenous Hormone Use on Cognitive Function in Mid- and Late Life. Journal of the American Geriatrics Society. Published online. DOI:10.1111/jgs.14658.
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