By Russell Jarvis The Samsons of Waterford, Michigan, are a typical American family. So are the Ortegas of Tularosa, New Mexico. The Sulemans immigrated to Centerville, Virginia, last year. The Bakers retired to Bradenton, Florida, and the Kovalenkos bought a house in Wheaton, Illinois. The Ibangas started their twins in kindergarten in Havre de Grace, Maryland. Today”s Americans are multiethnic, formed into families of various definitions, young at heart, and older on the average. They enjoy reasonably good health and hope for pleasant retirements. They have found friends at work, at dance lessons, and at the fitness center. They may