question: Which age group made up less of the population, between 20 and 24 years or between 30 and 34 years?
#1 return age groups 
#2 return population of #1 
#3 return #2 where #1 is between 20 and  24 years  
#4 return #2 where #1 is between 30 and  34 years  
#5 return which is lowest of #3 ,  #4