How many million people in the immigrant population are not between the ages of 18 and 50?
return immigrants ;return #1 that are between the  ages of 18 and  50 ;return population in  millions of people of  #1 ;return population in  millions of people of  #2 ;return the  difference of #3 and  #4
['select', 'filter', 'project', 'project', 'arithmetic']