Practicing using a "flag": please point in right direction

[buran]

it's more common to skip the flag

while True: 
    age = input("\nWhat is your age?\n(Enter 'quit' when you are finished.)" ) 
    if age == 'quit': 
        break
    age = int(age)
    if age < 3:
        print("\nYour ticket is free!") 
    elif age < 12: 
        print("\nYour ticket is 10$!") 
    else:
        print("\nYour ticket is 15$!")