On The Mountain Life , author Kayleen Schaefer, talks about her new book: BUT YOU’RE STILL SO YOUNG : How Thirtysomethings Are Redefining Adulthood. Schaefer points out five major events that can structure this time of life, including: completing school, leaving home, getting married, becoming financially independent, and having a child. Schaefer shares findings from data research and hundreds of interviews conducted nationwide.