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Over time, the older-guy-with-younger-gal lifestyle would lift the lifespan ceiling for both men and women in the next generations and so on. Anthropologist Cheryl Jamison of Indiana University, who was not involved in the research, called the results "fascinating. Wall of death From an evolutionary perspective, women who can no longer reproduce are non-players, and since "it takes two," men partnered with menopausal women are also irrelevant.
Following that idea, natural selection should select for harmful mutations that impact women after menopause. Over time, the discriminating genes would accumulate in the population causing what evolutionary biologist William Hamilton called the "wall of death," in which mortality of professiional spikes at the onset of menopause.
Population records and everyday observations indicate that's not the case. Life expectancy for men and women in today's industrialized countries is 75 to 85 seejing, with mortality increasing gradually, not abruptly, following female menopause.
Men matter To figure out whether male fertility could help explain human longevity, Shripad Tuljapurkar of Stanford University and his colleagues examined lifespan and fertility data from both men and women.
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They studied four societies thought to closely mimic lifestyles of our ancestors, including two hunter-gather groups, the Dobe! Kung of the Kalahari and the Ache of Paraguay one of the most isolated populations in the worldas well as the Yanomamo forager-farmers and an indigenous group in Bolivia called the Tsimane.
The research team also looked at farming villages in Gambia and a group of modern Canadians. Oriientated all six groups, women stopped having children on average by their 50s, while some men continued to reproduce.
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The age after which men showed no reproduction varied among the groups and included:. Mate choices Until now, the most popular explanation for the bounty of overs, called the "grandmother hypothesis," suggested women get a life extension in order to care for their children and grandchildren.
The new findings don't contradict that hypothesis, but help explain how men give women another boost over the "wall of death. But why do men choose younger mates and females prefer older men?21 Hung Crescent Good Sex
And inactor Tony Randall, then 75, married and had two kids with Heather Harlan, who was 24 at the time. Last month, year-old Nanu Ram Jogi from India reportedly became the world's oldest father when he announced his 21st child.
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Evolutionary psychologists argue that older men have more resources to protect and care for the family, while younger, more fertile women give their male partners better means of passing along genes. People in their 20s and early 30s are in the process of breaking away from home and starting new careers and friendships, so change for them is often a constant, says Heitler.
Another disadvantage to having children later in life is that the children are more likely to lose their parents sooner to death, says Duvall. That also goes for grandparents, aunts, uncles and other older members of the extended family, which diminishes the family base.
My first child was born 24 days before my 40th birthday. Four years later, almost to the day, she was joined by two brothers.
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When we learned that my wife was pregnant the first time -- and even more so the second -- I wondered: Would I be the oldest parent at the PTA meeting? Would I be able to throw a football with them?
Would people mistake me for their grandfather? Would I live to be a grandfather? I needed a plan.
Six months after my daughter was born, I started an exercise regimen. I also keep my weight, cholesterol and blood pressure down.Discreet Married Women Marathon Com
I learned early on that my kids were multitasking, not distracting themselves with music and TV while doing homework. Fortunately, their grades and other accomplishments have borne out that theory.
And, I also learned a valuable lesson. But it can be learned.
It helps them to grow up under the warmth and tutelage of a good therapist -- hopefully. Other obstacles nale youth or age can be overcome, too. Take the energy issue for older parents.