Background and Aim: As one of the most important crises in the world, the aging of the population has a significant impact on national authority, which can have negative effects on various dimensions of authority. The purpose of the current research is to investigate the impact of the aging population on national authority, and it has been investigated in four areas: economy, maintaining the revolutionary spirit, security and military power, and advanced science.Methods: The current study is a systematic review collected in 2024. Documents and materials related to the subject were accessed on websites such as ScienceDirect, PubMed, SID, Magiran, Health.gov, Online library, Civilica, etc. The search was conducted using keywords such as population aging, national authority, and military power. A total of 320 articles were found and after studying the abstracts, 90 relevant and valid articles were obtained. After a full study of the articles, 46 articles completely related to the subject were identified.Results: Based on various research and studies, the aging of the population has a negative effect on the economy, the maintenance of revolutionary spirit, military power, and advanced science. As the population ages, productivity and the active workforce will decrease, leading to an economic decline. As the population ages, the number of people active in political and social movements decreases, resulting in a decline in the revolutionary spirit in society. With the aging of the population, the costs for the welfare of the elderly military forces increase and the care for strengthening the military power decreases, and also with the reduction of the younger military power, the military power undergoes changes. As the population ages, scientists are focusing on addressing age-related diseases, cognitive decline, and the well-being of the elderly, and the progress of science is moving towards improving the well-being of the elderly.Conclusion: Population aging poses critical challenges to national security, including a declining working-age population, increasing healthcare costs, and economic consequences. However, by embracing technology, adapting recruitment strategies, investing in training, and strengthening international cooperation, the armed forces can mitigate these challenges and maintain readiness and effectiveness in the face of an aging population.