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Study reveals average age at conception for men vs. women over past 250k years

phys.org

121–130 of 166 posts

Re: Study reveals average age at conception for men vs. women over past 250k years

#121
post #83

Earlier quoted context omitted.

This point was already addressed in the research. It is tiring to see this low effort comments on every research thread, thinking that the researchers are idiots and there is no need to read the article to reject it.

Not everyone subscribes to Science Advances . I can't even get their page to load. Humor us and try to explain your thoughts instead of complaining about the "effort" of the GP, please. The answer to GP's objection is not explained in the linked article, as far as I can tell. The writers of a research paper have a vested interest in seeming smart and displaying their findings as a novel contribution to the greater co…

> Not everyone subscribes to Science Advances.

Science Advances is open access, so no subscription is required. For those looking for the article: https://www.science.org/doi/10.1126/sciadv.abm7047

Re: Study reveals average age at conception for men vs. women over past 250k years

#122
post #3

A lot to unpack (read - wildly speculate about) here. 10,000 generations ago. Like the next one but less of a "solved game". 1000 generations ago - Old men coupling with young women reads as small-scale tribal society to me. Polygamy, pride-of-lions. Groups are small enough that village elders control the, uh, means of production. The bottleneck on food is natural stocks. 200-300 generations ago lines up with the daw…

I watch a lot of old movies (30s-40s-50s). A ton of them have a 40s-50s man marrying a 20s woman. No idea if that was societal norm, mens fantasy, or whatever. I have to kind of believe movie execs would want the largest audience and so if 40s-50s men dating 20s women was not appealing to women of the time they'd been losing 1/2 the market. But, maybe these particular movies were the male equivalent of romance novels…

women in their 20's wanting someone close to their age is a recent phenomena and only in the western world. Go to Africa, Asia, South Smerica or even eastern Europe and wonen in their late teens to early 20's will regularly express an interest in guys in their 30's or 40's.

tldr: America is a woman's dating market but the odds are better stacked for men once you leave the country.

Re: Study reveals average age at conception for men vs. women over past 250k years

#123

Earlier quoted context omitted.

I watch a lot of old movies (30s-40s-50s). A ton of them have a 40s-50s man marrying a 20s woman. No idea if that was societal norm, mens fantasy, or whatever. I have to kind of believe movie execs would want the largest audience and so if 40s-50s men dating 20s women was not appealing to women of the time they'd been losing 1/2 the market. But, maybe these particular movies were the male equivalent of romance novels…

What world do you live in where 50 year old men don’t want 20 year old wives?

I'm in my mid to late 30s and I don't want a 20 year old wife. I can't even imagine that at 50.

Re: Study reveals average age at conception for men vs. women over past 250k years

#124

Earlier quoted context omitted.

What world do you live in where 50 year old men don’t want 20 year old wives?

Why would you want a 20 year old wife at age 50. The maturity gap would be almost unbridgeable. The only benefits are sexual and even then the maturity aspect might play a part. Even in my late 20s, the idea of someone who has just left their teens would be deal breaker

If a man at 50 wants to marry, it is usually because he wants kids, otherwise there is no reason to get married at that age. If he wants kids, the woman must be in the fertility age, which is 15 to 35, with the best bet in the 20-30 interval. Just biology. Yes, the maturity gap is big, but if that is the price to pay to have kids ...

Re: Study reveals average age at conception for men vs. women over past 250k years

#125
post #106

Earlier quoted context omitted.

If a woman bears many children throughout her life, you can still have a situation where the first pregnancy occurs much earlier than today's average yet the overall conception average is roughly same as nowadays.

Even 200 years ago, it was common for women to give birth 10 times. I bet 100k years ago, some women were pregnant yearly, from teenage to menopause.

Breastfeeding works as a natural contraceptive, so I highly doubt it - babies would need to be on solid foods without breastfeeding, and that was much harder in the past then it is now.

Re: Study reveals average age at conception for men vs. women over past 250k years

#126
post #8

Somewhat grim, but this has to be disregarding the humans who never reach the reproductive age or the ones who cannot keep their offspring alive. So there is some survivorship bias baked into the methodology.

By definition yes.

"Average age of people who gave birth include people who never give birth?" or "Is a selection bias to include only people who gave birth in the selection of people who gave birth" sound completely different if asked this way, right?

Re: Study reveals average age at conception for men vs. women over past 250k years

#127

A few points, female fertility declines steeply past 40, but males not so much, so older males could conceivably father children with other females. Dare I say it, and this may just be not right, Genghis Khan is purportedly supposed to have fathered thousands of children it is said he had 500 or so secondary wives (citation needed). Since average (mean) income is famously a bit pointless due to a few very rich people…

You are right on the first part, just got the number wrong: the female fertility starts to decline a lot earlier, below 30.

Re: Study reveals average age at conception for men vs. women over past 250k years

#128
post #98

Tbh, I thought in early humans females got pregnant at 12-15. Simply because that when they begin to have the capability to have kids.

Are female hunter-gatherers even sexually mature by 12-15?

Sexually mature? Definitely not. Able to procreate? That depends on nutrition, probably not, only a few years later (15-17).

Re: Study reveals average age at conception for men vs. women over past 250k years

#129

Earlier quoted context omitted.

I watch a lot of old movies (30s-40s-50s). A ton of them have a 40s-50s man marrying a 20s woman. No idea if that was societal norm, mens fantasy, or whatever. I have to kind of believe movie execs would want the largest audience and so if 40s-50s men dating 20s women was not appealing to women of the time they'd been losing 1/2 the market. But, maybe these particular movies were the male equivalent of romance novels…

You know this hasn't stopped, ie Tom Cruise is 60 and you won't see him having female partners above 40, that look like 30. Sure he doesn't look his age, be it genes, good lifestyle, laser treatments etc. but he always looks much older than his partners. It happens in real life too - successful older men being with much younger females is normalized by society and a common sight. The opposite not so much though.

Top Gun: Maverick came out last year, and features Jennifer Connolly (52) as his love interest. That’s still an age gap, but she certainly isn’t under 40.

Re: Study reveals average age at conception for men vs. women over past 250k years

#130

That title … the way it is written, sounds like the only accurate answer is … 0 . […] average age at conception […] I’m a programmer. I guess I’m used to literal interpretation.

-9 months since it's conception and not being born

Some cultures count the nine months in the womb. So you are nine months old on your date of birth.
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