Middle age is typically defined as the period of life between young adulthood and old age, usually encompassing individuals between the ages of 40 and 65. During this stage, people may experience various physical, cognitive, and emotional changes as they transition from being young adults to older adults. Research in the field of middle age often focuses on understanding the social, psychological, and health-related factors that impact individuals during this life stage. This may include studying the effects of stress, lifestyle choices, and relationships on overall well-being, as well as examining how middle-aged individuals navigate career transitions, family responsibilities, and personal fulfillment. Additionally, research in middle age may also explore the incidence and management of chronic health conditions that become more prevalent during this stage of life, such as cardiovascular disease, diabetes, and osteoporosis. Overall, the study of middle age plays an important role in informing strategies for promoting healthy aging and enhancing quality of life in later years.