Scientific advances now enable us to measure your true age with much greater precision than ever before. The backward-looking metric of chronological age is passé and has been superseded by the forward-looking measure of remaining lifetime. In the not-too distant future your phone, watch or even your clothes will measure and report how old you really are and how long you will likely be spending in retirement. This brief book examines the personal financial implications of this "new age" development and focuses on how to guarantee a sustainable income stream for the remainder of your biological life.