Lifespan development is the study of how people grow and change throughout their lives, from infancy to old age. It examines physical, cognitive, and emotional changes that occur at different stages, including childhood, adolescence, adulthood, and late adulthood. Researchers in this field explore how genetics, environment, and experiences influence development. This area of study is important for understanding human behavior and relationships. It helps professionals in fields like psychology, education, and healthcare to support individuals at various life stages. By recognizing the unique challenges and milestones of each phase, we can better address the needs of people as they age.