Adulthood involves transitioning priorities from adolescence through life. As adults age, their skin, muscles, and senses deteriorate while health risks like heart disease and cancer increase. Middle age is a time of crisis regarding one's purpose and legacy. Marital success depends on constructive conflict resolution and intimacy, though divorce is common. Sexual activity does not necessarily decline with age if one maintains health and interest in their partner. Adulthood involves several transition periods as adults establish independence, careers, families and adjust to changes like children leaving home.