Living beyond 30 made you 'old' 30,000 years ago!

Wellington, Sept 11 (ANI): A new study suggests that people during the Paleolithic age, which was around 30,000 years ago, hardly lived beyond 30.

The fundamental structure of human populations has changed exactly twice in evolutionary history.

The second time was in the past 150 years, when the average lifespan doubled in most parts of the world.

The first time was in the Paleolithic, probably around 30,000 years ago. That's when old people were basically invented.

Throughout hominid history, it was exceedingly rare for individuals to live more than 30 years, Stuff.co.nz reported.

Paleoanthropologists can examine teeth to estimate how old a hominid was when it died, based on which teeth are erupted, how worn down they are, and the amount of a tissue called dentin.

Anthropologist Rachel Caspari of Central Michigan University used teeth to identify the ratio of old to young people in Australopithecenes from 3 million to 1.5 million years ago, early Homo species from 2 million to 500,000 years ago, and Neanderthals from 130,000 years ago.

Old people - old here means older than 30 - were a vanishingly small part of the population.

When she looked at modern humans from the Upper Paleolithic, about 30,000 years ago, though, she found the ratio reversed-there were twice as many adults who died after age 30 as those who died young.

The Upper Paleolithic is also when modern humans really started flourishing. That's one of the times the population boomed and humans created complex art, used symbols, and colonised even inhospitable environments.

Caspari says it wasn't a biological change that allowed people to start living reliably to their 30s and beyond. Instead, it was culture. Something about how people were living made it possible to survive into old age, maybe the way they found or stored food or built shelters, who knows.

That's all lost-pretty much all we have of them is teeth-but once humans found a way to keep old people around, everything changed.

We're now on the other side of the second great demographic change in human evolutionary history.

The main reason lifespan doubled in the past 150 years is that infant mortality plummeted.

Just as having old people around changed human culture profoundly 30,000 years ago, having infants and children survive has fundamentally changed modern society. (ANI)

Matches

MORE TOP STORIES TODAY

Delhi Daredevils vs Royal Challengers Bangalore

Delhi Daredevils vs Royal Challengers Bangalore

Kohli wins the toss and puts Delhi into bat. Chris Gayle MISSES OUT!!! More »

BCCI to meet before next court hearing

BCCI to meet before next court hearing

The BCCI will hold an emergent working committee meeting on April 20 to discuss the future course of action with regard to the Supreme Court hearing concerning… More »

Kallis, Narine star in Knight Riders’ crushing win

Kallis, Narine star in Knight Riders’ crushing win

An all-round display saw Knight Riders thump Mumbai Indians by 41 runs in the IPL-7 opener. More »

Gavaskar wants a clean IPL

Gavaskar wants a clean IPL

"Integrity is non-negotiable..." says the BCCI's interim chief ahead of Season 7 of the tainted league. More »

'Yak' Kallis still on top of his game

'Yak' Kallis still on top of his game

The 38-year-old South African veteran turned it on for Kolkata Knight RIders in the opening match of IPL-7. More »

Srinivasan named in fixing report: SC

Srinivasan named in fixing report: SC

The court emphasised that the tainted administrator can no longer work for the BCCI. More »

Yuvraj happy to play for RCB: Kohli

Yuvraj happy to play for RCB: Kohli

New-look RCB will play their first game of IPL-7 on Thursday. More »

IPL: News Line

IPL: News Line

A round-up of all the news from this season of the IPL. More »

Shane Watson issues moral warning

Shane Watson issues moral warning

'Everyone knows what is right and what is wrong and if you do the wrong thing it will be found out' More »

Johnson may quit T20s for Tests

Johnson may quit T20s for Tests

Australia's Mitchell Johnson may quit limited-overs cricket to prolong his test career with an eye on the 2015 Ashes series in England, the fast bowler… More »

There's a lot going on: Fleming

There's a lot going on: Fleming

He experienced anxious moments in the lead-up to the tournament as the courts decided on whether to suspend the franchise, he said, but stressed that the… More »

Why I'm not looking forward to the IPL

Why I'm not looking forward to the IPL

Welcome to another season of a league that many watch but few trust. More »

Nepal players call off boycott

Nepal players call off boycott

Thaw in relations after formation of an advisory committee that would work in tandem with the Cricket Association of Nepal. More »

Latif couldn’t work with tainted players

Latif couldn’t work with tainted players

Former Pakistan cricket captain Rashid Latif said Tuesday he turned down the job of national chief selector because he could not work with ex-players tainted… More »

We are not over-confident: Bailey

We are not over-confident: Bailey

Indian Premier League — George Bailey-led Kings XI Punjab will face Chennai Super Kings on Friday. More »

Big runs expected, with bat and ball

Big runs expected, with bat and ball

Royal Challengers Bangalore: Their main concern, once again, is the fast bowling More »

Taxing issue — BCCI hits roadblock

Taxing issue — BCCI hits roadblock

MoU between BCCI & its units to avoid double taxation delayed after a few decline to share details. More »

Black Caps pick rookie duo for West Indies

Black Caps pick rookie duo for West Indies

New Zealand selectors included two new caps in a 15-man Test squad named Tuesday to tour the West Indies, with injury-hit spinner Dan Vettori's future… More »

The stage is set for IPL-7 to start

The stage is set for IPL-7 to start

The Preview — Defending champions Mumbai Indians take on Kolkata Knight Riders More »

Srinivasan appeals to court to allow BCCI comeback

Srinivasan appeals to court to allow BCCI comeback

He was aggrieved by the allegations against him during the hearing. More »

India: cricket's Brazil

India: cricket's Brazil

They are tough to beat with a big talent base exposed to good facilities. (CYCSPL) More »

Delhi Daredevils say no to gifts

Delhi Daredevils say no to gifts

Franchises are doing their bit to refurbish the image of the tainted league. More »

Klinger on his exit from South Australia

Klinger on his exit from South Australia

Michael Klinger has revealed he felt compelled to leave South Australia after being told he would be only a fringe part of the Redbacks' plans for next season, and disputed the suggestion that he left… More »

India-Pakistan Test series likely in 2015

India-Pakistan Test series likely in 2015

The revival of Indo-Pak Test ties could take place in UAE. More »