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This wikipedia page will be your help.
https://en.wikipedia.org/wiki/Population_pyramid
I will rewrite it soon.
if we died around 30yo. we would never have levelled out tech. Average life expectancy is low because of high child mortality, not short lifespans...
In the stones age, you have around 45% chance to die before reproductive age (otherwise, specie die, if less than haf reproduce...) and then about 10% chances to be murdered (yes...) and then about 75% chances to see you're 45 to 60's.
then you're dead. Living beyond 60 without modern medecine is sheer luck (or king level of lifestyle)