Debra Whitman, executive vice president and chief public policy officer at AARP, discusses her new book, “The Second Fifty: Answers to the 7 Big Questions of Midlife and Beyond,” and the messages it has for senior living providers and others. Among the insights she shares are those related to her experience with assisted living through her father-in-law, tackling workforce issues, older adults' financial security — or lack of it, and the benefits of bringing several generations together.