Get the sum of branches grown in an specific age.

        Returns:
            int: The sum of all nodes grown in an age.

def get_node_age_sum(self, age=None):
        """Get the sum of branches grown in an specific age.

        Returns:
            int: The sum of all nodes grown in an age.
        """
        if age is None:
            age = self.age

        return pow(self.comp, age)