The conversation between human and AI assistant.
If humans stopped reproducing, what would the chain of events be, from now to the death of the last person? 
How long do you think it would take for the population to dwindle to a very small number?
It is difficult to estimate the exact time frame since it would depend on many factors such as the current global population, life expectancy, and mortality rates. However, it is safe to assume that it would take many decades, if not centuries, for the population to drastically decrease.