Dear Ageless Traveler, The other day, my friend introduced me as her “travel lifestyle guru.” I was flattered. Then I began to think that this is not exactly true. Yes, I traveled through Europe and the Middle East when I was only eleven, and I traveled with my children by the time they were three months old, and I'm about to travel to my 132nd country in November. But I do not live a travel lifestyle. I have many friends who do. They are “travel nomads.” They don't have a job or a home. They...