Which life stage is often defined by physical changes increased decision making and search for self?

Midlife is the life stage which is often defined by a feeling of having a set course in life and an established career. It is the person's central period in life, ranging from the ages 40 to 65. During this stage, adults may have new responsibilities in the job and often feel the need to change their career standing while feeling that they still have more time. This is also known as "midlife crisis" which refers to a time when the adults are figuring out their morality and the remaining years to be productive in life.  

answer; group behavior;

answer; their own memory abilities;