The document discusses several key changes that occur during late adulthood and old age. Physically, the body slows down as skin loses elasticity, hearing and vision decline, and the immune system weakens. Mentally, the brain shrinks and loses plasticity, resulting in problems like memory loss and decreased intellectual function. Socially, older adults often experience loneliness as friends and family pass away. They also confront their mortality and may feel a sense of integrity or despair when reflecting on their life. The document examines these changes and stages of adjustment that people experience as they age.