During most of life's journey, we rarely give thought to the time when we will be senior citizens. When it suddenly arrives, some of us are anxious to enjoy the world of AARP, Medicare, Social Security and ticket discounts. Others are fearful of the physical changes we don't wish to acknowledge or admit. We find ourselves in the midst of retirement from a long-time career, facing the care of aging parents, looking forward to travel, or finding ways to use all this free time productively. Those of us who have "arrived" at this point in life's adventure have been immersed in both positive and...