Get a work experience.

        :param working_start_age: Age then person start to work.
        :return: Depend on previous generated age.

def work_experience(self, working_start_age: int = 22) -> int:
        """Get a work experience.

        :param working_start_age: Age then person start to work.
        :return: Depend on previous generated age.
        """
        age = self._store['age']
        if age == 0:
            age = self.age()

        return max(age - working_start_age, 0)