Every generation has its life-defining moments. If you want to find out what it was for a member of the Greatest Generation, you ask: "Where were you on D-Day?" For baby boomers, the questions are: "Where were you when Kennedy was shot?" or "What were you doing when Nixon resigned?"

For much of my generation—Generation X, born between 1965 and 1980—there is only one question: "When did your parents get divorced?" Our lives have been framed by the answer. Ask us. We remember...