class Customer:
    def __init__(self, first_name, family_name, age):
        self.first_name = first_name
        self.family_name = family_name
        self.toshi = age

    def full_name(self):
        print(f"{self.first_name} {self.family_name}")

    def age(self):
        print(self.toshi)


ken = Customer(first_name="Ken", family_name="Tanaka", age=15)
ken.age()  # 15 という値を返す

tom = Customer(first_name="Tom", family_name="Ford", age=57)
tom.age()  # 57 という値を返す

ieyasu = Customer(first_name="Ieyasu", family_name="Tokugawa", age=73)
ieyasu.age()  # 73 という値を返す
