"Middle-aged" typically refers to individuals who are in the stage of life between young adulthood and old age, generally considered to be between the ages of 40 and 65. This period is often characterized by various life changes, including career advancements, family responsibilities, and shifts in health and lifestyle. During middle age, people may experience a range of physical and emotional changes, such as decreased metabolism and increased stress. This stage can also be a time for personal growth, as many individuals reassess their goals and priorities, often leading to new interests or career paths, sometimes referred to as a midlife crisis.