Final answer:
Baltes means that human development is a continuous process from conception to death, which encompasses adaptation, learning, and evolution through selection, optimization, and compensation.
Step-by-step explanation:
When Baltes says that development occurs throughout the lifespan, he is referring to the idea that human growth and change happen continuously from conception to death. This concept is a cornerstone in the field of developmental psychology and is explored through theories such as selective optimization with compensation. It highlights that people of all ages can adapt, learn, and evolve by focusing on their personal strengths while compensating for losses or challenges, particularly in later life stages. The theory emphasizes selection, optimization, and compensation as crucial components for successful development throughout the life course, with each individual setting specific goals based on their unique circumstances and experiences.