Theories of aging

Biologic theories of aging:
a) gene theory
b) somatic mutation theory
c) biological clock theory
d) immunological theory
e) free radical theory
f) cross-link theory
g) wear and tear theory

Psychosocial theories of aging:
a) disengagement theory
b) activity theory
c) continuity theory
d) subculture theory
e) structural dependency theory

Developmental stages of aging:
a) Erik Erikson
b) Peck
c) Havighurst