Final answer:
Middle adulthood is characterized by physical signs of aging, decline in physical abilities, goals achievement, and increased risk of chronic diseases.
Step-by-step explanation:
Middle adulthood, which begins in the mid-30s and extends until the mid-60s, is characterized by physical signs of aging, such as wrinkles and gray hair. During this stage, people may also experience a decline in vision, strength, reaction time, and fertility.
Additionally, middle adulthood is a time when individuals strive to achieve career goals and raise a family. It is also a stage when chronic diseases like type 2 diabetes, cardiovascular disease, and cancer are often diagnosed.