Problems with scripts

[Lauren Fugate]

So I changed my code to this:

print("How old are you: 17, 18, 19, or 20?") 
answer = input("> ") 
if int(answer) == 17 or 18 or 19 or 20:
    print("Wow, you are old!") 
else:
    print("You just can't follow drections, can you? Choose either 17, 18, 19, or 20.")
    input("> ") 

and now if I input any of the preferred answers it will print "Wow, you are old!" like it should. But if I enter a word, like "hi", it will return an error.