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

phys.org

71–80 of 166 posts

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

#71

The link to the paper wasn't loading for me. But I would love to see the reasons for extrapolating present-day biology back 250k years?

A fundamental tenet of much modern science (and, especially, punditry) is that humans have completed the evolutionary process.

I thought we still need to evolve into crabs?

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

#72

Earlier quoted context omitted.

A fundamental tenet of much modern science (and, especially, punditry) is that humans have completed the evolutionary process.

I've never heard this before. Do you have a source?

I guess it was derived from the old (or layman?) definition of evolution as survival of the fittest as in human society the unfit survive with the help of medicine, technology and charity.

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

#73

The perennial older male age is because men are fertile longer than women so statistics would tend to this pattern over a large enough population. There's power asymmetry, people are monsters and sexual predation is rampant but there's also biological feasibility at play here. To demonstrate, let's say that we have an imaginary equalityville where for every age pairing and sex act, there is an exactly equal one with…

And yet https://imgur.com/Ijgzwsk

source?

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

#74
post #49
post #29

Earlier quoted context omitted.

I know that's a common conception about the past, but what's the actual evidence for it? There are plenty of social and religious norms even today that keep people from getting together too young. There's also no reason not to think people at the time understood how sex and pregnancy worked. They didn't have the internet but they were as intelligent as we are today. I'm sure they could figure out how to have "fun" wi…

The Bible and plenty similarly old texts refers to marriage of such young women to usually older men, but even Romeo and Juliet is about 14 years olds. Biological fertility as a baseline only slightly modified by social norms seems to be a good guess.

Romeo and Juliet is fictional.

I mean sure, could count as "evidence" but you'd have to be aware of the strength of it.

Imagine in a 100 years time, the next civilisation finds some popular dvd and tries to draw conclusions from it.

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

#75

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?

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

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

#76
post #29

Earlier quoted context omitted.

I know that's a common conception about the past, but what's the actual evidence for it? There are plenty of social and religious norms even today that keep people from getting together too young. There's also no reason not to think people at the time understood how sex and pregnancy worked. They didn't have the internet but they were as intelligent as we are today. I'm sure they could figure out how to have "fun" wi…

Of course they did, which is how silphium got to be extinct. https://en.wikipedia.org/wiki/Silphium

> The cause of silphium's supposed extinction is not entirely known but numerous factors are suggested.

> The plant may also have functioned as a contraceptive and abortifacient.

You are far more confident on this than Wikipedia. Are you an expert on it?

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

#77
post #43

Earlier quoted context omitted.

Not parent commenter, but what can be argued is that evolutions “rules” are way different to us then to any other animal (except the ones we closely handle ourselves). E.g. healing people, far smaller infant death rates, no basically no food scarcity from natural causes, etc. Our selection process is societal, not “natural”.

Our selection process looks pretty natural to me. Also we solved food scarcity, like, a century ago?

Is our weak culled by predators, or are we pressured towards some change (e.g. more efficient digestive track) due to food scarcity?

Those would be some natural selection processes, and they don’t apply to us in any significant way since.. I would say the agricultural revolution at least, but maybe even sooner (the very reason we can “feed” such a hungry organ as our brains is due to our efficiency at hunting/processing food even back then thanks to tools/fire)

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

#78
post #49

Earlier quoted context omitted.

The Bible and plenty similarly old texts refers to marriage of such young women to usually older men, but even Romeo and Juliet is about 14 years olds. Biological fertility as a baseline only slightly modified by social norms seems to be a good guess.

Romeo and Juliet is fictional. I mean sure, could count as "evidence" but you'd have to be aware of the strength of it. Imagine in a 100 years time, the next civilisation finds some popular dvd and tries to draw conclusions from it.

I just mentioned it as a much later example for early marriages, but my other example(s) wasn’t refuted.

Also, I think quite a lot can be reconstructed from even primitive drawings, let alone a whole dvd we know got popular and thus even more relevant for an age.

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

#79

The perennial older male age is because men are fertile longer than women so statistics would tend to this pattern over a large enough population. There's power asymmetry, people are monsters and sexual predation is rampant but there's also biological feasibility at play here. To demonstrate, let's say that we have an imaginary equalityville where for every age pairing and sex act, there is an exactly equal one with…

Where's the paradox? Live births drive evolution afterall. Wouldn't such a massive survival difference start to show up in mate age preferences getting "coded" into our genes?
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