why are lifestyle and health behaviors significant for age groups

Select a life stage group (maternal, infant, child, adolescent, young adult, adult, elder). Why are lifestyle and health behaviors significant for your selected age group compared to other age groups? How can community health efforts affect leading causes of death for the age group you selected? What are ways community programs can increase participation in prevention services? Reference and cite examples of programs that are addressing your groups main issues. What research supports these efforts? Please include references.