This article was conducted to investigate the effect of population aging on social, cultural and economic structure in the future of Tehran. Materials and research methods were qualitative studies based on Delphi method. In this study, eleven experts in the field of aging were identified by snowball method, interviewed and by expressing their experiences, the effective components of the phenomenon of aging on social, cultural and economic structures were identified. The research tool was a questionnaire that through Delphi used SPSS and Excel software to classify statistical cases and general consensus and reliability during three periods. The results showed that the aging of Iranian society in the coming decades will cause the inability of the government to meet the various needs of the elderly, reduced labor and loneliness and depression. According to the results of the present study and previous research, many factors of the phenomenon of aging affect the three structures of research (social, cultural, economic): economic problems, lack of active manpower, generation gap, decline and gap in the culture of respect and sanctity of elders in the family, extinction And changing the structure of the family and ... that by recognizing these factors, the optimal use of desirable factors and controlling the factors that have the destructive effects of aging on the structures of society, the realization and achievement of a desirable future of society and especially the elderly will be faster.