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Milestones. Formerly distance markers in ancient times. (add photo). In today's modernity we use the term in somewhat different ways. Milestones now mark significant events in our lives. The day we met, the passing of a loved one, starting dates, ending dates, graduations and anniversaries alike, and of course everybody's favorite day to celebrate, our annual birthday. In our youth, birthday's represented rites of passage, where society metes out privileges in small increments. Turn sixteen, you get to drive, eighteen you're no longer a minor, at twenty-one you can finally take a seat at a bar and order your first adult beverage (legal one, that is). For us on the wrong side of young, society wisely spreads the milestones out some. We age up every 5 years in our tennis world, not the frenetic 2 years of our junior days. Once we cross the senior discount line, the benefits really start a-coming. Had enough of kids? There's a shiny new senior living complex just for