puts "Enter the customer's age: "
     # Get an integer age value from the user
     age = gets.to_i
     
     # Determine the cost based on age
     if ((age <= 12) or (age >= 65))
       cost = 9
     else
       cost = 18
     end
      
     # Print out the final cost
     puts "Ticket cost: " + cost.to_s