You can travel with kids.
My point was apparently not obvious enough, but I know many couples who don’t want to wait until they are retired 50 years from now, to travel and live their life.
For example one couple opted not to live in a city, with the corresponding high cost of living, and instead chose to live in an area similar to where they had grown up spending adventure vacations. The days of working for one company for 30 or 40 years and retiring with a pension is long gone. With a small dish, you can telecommute from the most out of the way places on earth!
What millennials want, is not necessarily what their boomer parents chose.
http://www.seattlepi.com/local/article/Couple-circles-the-globe-in-a-30-year-old-5873722.php#page-2