4. What strategies might Rosie use to remain healthy, vigorous, and cognitively sharp during her golden years? We have traced major events in the development of physical, social, and cognitive growth throughout the life span. Clearly, people change throughout their lives.

As we explored each area of development, we encountered anew the nature–

nurture issue, concluding in every signifi cant instance that both nature and nurture contribute to a person’s development of skills, personality, and interactions. Specifi cally, our genetic inheritance—nature—lays down general boundaries within which we can advance and grow; our environment—nurture—helps determine the extent to which we take advantage of our potential.