There is no simple formula for population growth.

Some of the factors that you need to take account of are:

Emigration rates

Immigration rates

Demographics

Age-specific fertility rates

Death rates

The crude death rate is the number of deaths in a population per 1,000 people, without considering age or other factors. Age-specific death rate, on the other hand, is the number of deaths within a specific age group per 1,000 people in that age group. Age-specific death rates provide a more detailed understanding of how mortality varies across different age groups within a population.

The rates are as follows in the USA, note that there are no family rates: Age Over 16 $45 Age Under 16 $35

There is no specific record for the tallest person at the age of 14 as growth rates can vary greatly among individuals. Growth spurts often occur during adolescence and can impact height.