What do you think about the existence of senior citizens who, instead of retiring or retiring from social activities, change their careers and engage in economic activities necessary for their livelihood? It seems to me that trying to change careers in one’s 60s or 70s, when one is practically approaching retirement age, would require a great deal of mental strength, patience, and endurance, as well as physical strength. In fact, the wisdom and experience that senior citizens in their 60s and 70s have cultivated in their lives are valuable human resources that should be utilized for the economic development and prosperity of society.