What do you believe are two of the most significant challenges experienced in older adulthood?

After reading Chapter 15, Invitation to the Life Span 4th edition Kathleen Stassen Berger as well as viewing the material for this week, please answer the following question using complete sentences:
1) What do you believe are two of the most significant challenges experienced in older adulthood? Explain your reasoning. Please directly refer to the textbook and or provided materials in you response.