Question

\mohammed had been a science teacher for decades. when he retired, he taught science classes for the general public in the local senior center. this way of adjusting to changes in the lives of the elderly is called

Answer 1

I believe the answer is: Continuity theory
Continuity theory stated that under normal aging process, older adults usually will maintain the same behaviors and activities that they did in most of their adult life.  It is a form of defense mechanism that people do in order to maintain their youth within them.