A person's lifestyle has a significant influence on the person's health and development as he or she moves into middle age (and old age). Stability and change are also common factors in an adult's life. •Describe how middle adulthood provides stability in a person's life. Explain some of the factors that would lead to stability in a person's life as he or she moves through middle age. •Describe some of the more common lifestyle issues that have a negative impact on a person's continued development. Explain how a person may be able to reverse some of the lifestyle influences. •On the basis of your readings, describe what is meant by a midlife crisis. Explain why a midlife crisis may or may not be critical.