- 14 The older population has lower rates of hospitalization, surgery, and physician visits than other age groups ed out of Select one: O a. False. question O b. True. 15 Psychological theories of aging explore the: Select one: out of O a. behavior, O b. The mechanisms people use to meet the challenges they face in old age. question O c. Mental processes, O d. None of the above are true O e. All of the above are true O f. feelings of persons throughout the life span, 16 To explain biological aging, theorists have explored many factors, Select one: out of O a. None of the above are true O b. All of the above are true uestion O c. Internal (error in the DNA, free radical) O d. External (radiation, pollution) to the human body, O e. Have divided them into two categories: stochastic and . nonstochastic.