Millions of midlife Americans are starting to reevaluate their surroundings as their kids begin to leave the nest and they themselves start to think about retirement. Whether they're going from the multi-bedroom suburban house to a condo in the city, or downsizing from two homes to one, or making room for grandchildren to visit or an elderly relative to join the family, the trend for people in their 50s and beyond is a shift to well-planned living quarters that suit their age, stage, and situation. And in making this transition, they'll face the daunting task of paring down a lifetime of possessions while furnishing their new lives with things that have meaning.