int least_under_5(Population p[], int size)
{
    int least = 0;

    for (int i = 0; i < size; i++)
    {

	if ( (float)p[i].get_age(LessThan5)/p[i].total_pop()
	<  (float)p[least].get_age(LessThan5)/p[least].total_pop() )
		least = i;

    return least;
}