If you are an older adult, what could you have done better to optimize your health in middle age?

Although everyone experiences some physical change due to aging in the middle adulthood years, the rates of this aging vary considerably from one individual to another. Genetic makeup and lifestyle factors play important roles in whether chronic disease will appear and when. If you are a young or middle aged adult, what can you do at this point in your life to optimize your health in middle age? If you are an older adult, what could you have done better to optimize your health in middle age? Explain your answer.