python always answers you are likely to be eligible for work even though I typed a number under 18
question1= raw_input("are you fat?")
if question1== ("yes"):
print ("sorry you are not fit for work")
elif question1== ("no"):
print ("you may be eligible for work, move on to the next question please")
question2= raw_input("how old are you?")
if question2 >= 18:
print ("you are likely to be eligible for work")
elif question2 < 18:
print ("sorry come back when you're older")