Day 4 Class

class Person:
    def __init__(self,initialAge):
        # Add some more code to run some checks on initialAge
        if initialAge< 0:
            print("Age is not valid, setting age to 0.")
            initialAge = 0
        self.age = initialAge
    def amIOld(self):
        if age<13:
            print("You are young.")
        elif age>=13 and age<18:
            print("You are a teenager.")
        else:
            print("You are old.")
    def yearPasses(self):
        global age
        age +=1