input: Write a python function to demonstrate the use of classes by creating a simple class `Person` with attributes `name` and `age`, and methods to display these attributes.
  assert isinstance(Person("Alice", 30), Person)
  assert Person("Bob", 25).name == "Bob"
  assert Person("Charlie", 40).age == 40
output: class Person:
      def __init__(self, name, age):
          self.name = name
          self.age = age
  
      def display_name(self):
          return f"Name: {self.name}"
  
      def display_age(self):
          return f"Age: {self.age}"