Population demographics can have a significant impact on a country's threat level. China, with its declining population and aging workforce, is facing a potential threat in the future. The United States, although not in a great position, has more favorable demographics compared to countries like China, Japan, and Germany. On the other hand, countries like India and large parts of Africa, with their growing populations, are perceived as opportunities due to their positive demographic profiles. Demographics can also directly influence concerns and actions in international relations, as seen in the example of China's reluctance to invade Taiwan due to the potential loss of working-age men.