The Biological Theory of Aging proposes that aging is a natural process characterized by the deterioration of cells, tissues, and organs over time, leading to a decline in physical and mental functions.

The Activity Theory of Aging suggests that older adults who engage in meaningful activities and maintain an active lifestyle are more likely to experience a sense of well-being and life satisfaction.

Continuity Theory posits that individuals seek to maintain a sense of coherence and stability in their lives as they age by preserving their routines, habits, and social connections.

Transcendental Theory proposes that older adults may experience a shift in consciousness and a heightened sense of spirituality and interconnectedness with the universe, known as gerotranscendence.

Conflict Theory posits that social change is driven by struggles between different social groups over resources, power, and control.

Functionalist Theory suggests that social institutions serve to maintain social order and stability by fulfilling essential functions for society's survival and well-being.

Symbolic Interactionism focuses on how individuals interact with each other and construct shared meanings, which can lead to changes in social norms, values, and behaviors.

Dependency Theory argues that developed countries exploit developing countries through economic and political mechanisms, leading to a cycle of dependency and underdevelopment.

Technological Determinism posits that technological advancements are the primary driving force behind social change, shaping societal structures, values, and behaviors.

Modernization Theory suggests that economic development and social progress are driven by industrialization, urbanization, and the adoption of modern technologies and values.

Social Movement Theory focuses on the dynamics and processes of social movements, examining how collective action can bring about social change.

World-Systems Theory argues that the global economy is divided into core, semi-periphery, and periphery countries, with the core countries exploiting the semi-periphery and periphery countries through economic and political mechanisms.

Cultural Materialism posits that cultural values and beliefs are shaped by material conditions and economic factors, and that these cultural factors in turn influence social change.

Postmodern Theory suggests that contemporary society is characterized by fragmentation, diversity, and a rejection of grand narratives and universal truths.

Globalization Theory focuses on the increasing interconnectedness and interdependence of countries and regions, and how this affects social, economic, and political processes.