Maths and global population

[KenDodd]

Anyone good at maths?

If fertility rate was 1.9 per women and average age to give birth is 30, how long before the human race is extinct ?

Ah I didn't know that! Very interesting

@SilverRingahBells that last comment!

@KenDodd

Anyone good at maths?

If fertility rate was 1.9 per women and average age to give birth is 30, how long before the human race is extinct ?

Nowhere near enough data.

For a start you've ignored age at death/lifespan. If that turns out to be 29 then extinction is much closer than it it's (say) 60.

You also need to know what resources are available and at what rate they are being consumed and replaced.

You also need to factor in some sort of differential so that as the output changes, the input does.

I know it's theoretically possible to increase the human species lifespan by enforcing a delay to when mothers give birth over many generations. But it really didn't sound worth it.

@BigBrownCombineHarvestor

Of course there are lots of real factors such as the birth rate declining BUT if we take 1.9 at face value this already accounts for people dying or not procreating

Does it? Is the birth rate 1.9 for every two people born / every woman born or is it based on people reaching puberty?

@DGRossetti of course there isn't enough info to find THE ANSWER to human extinction, but as a lighthearted maths chat it works.

@SleepingStandingUp I may well be wrong, @SilverRingahBells has said it is from puberty.

I guess it would be up to the person posing the problem to make the definition, but I'm very happy to be wrong .

Yeah I saw Sivlers answer after u posted, that's what I thought was correct

After I posted