How much could a population of 13,000 grow in 50 years? They are just coming out of a 13-year war with many deaths and few births. They have no medicine or technology to extend life, many plentiful and nourishing sources of food, and a hotter-than-average (but livable) environment. The population started with ~6,900 women between 18 and 40 years of age, ~3,100 men between 18 and 40 years of age, ~300 children from 0-10, ~700 from 10-15, ~1000 between 15-18. The rest are over 40 years of age, and on average live up to 80 years. about 70 people a year die from being killed by animals. 10 deaths a year from disease. No other unnatural causes of death.
https://en.wikipedia.org/wiki/List_of_sovereign_states_by_natural_increase – fastest growing countries add 30-39 people per 1000 people, or about 3.5% per year
1.035^50 = 13.6-fold
They are just coming out of a 13-year war with many deaths and few births
Frame challenge on this. Why were there few births during the war? Wars normally show the opposite effect.
It depends on too many variables. How many children do the women have on average and what is the average age of a woman at her first baby and last baby?
All of the women could have 6 children or more (on average) and there would be time for all of that generation to have 10 children of their own. There would also be time for the grandchildren to have at least some children. And all or at least most of these people could still be alive.
Probably 500,000 or more is theoretically possible... but in practice it would be much less.