Travel is my greatest addiction, historically, though not the sort described in the OP's article about the young travelers.
Have never been gone for longer than 5 weeks and, after that, was glad to be home for awhile. A major motivation for ER was to have more time and freedom to travel in the off-season. I am hooked on seeing the typical historical and lit-oriented tourist sites, wherever I go. And the friend I usually travel with agrees that now, in our advancing decades, we enjoy the creature comforts that come with traveling in a more "mature" manner.
Which does surprise both her and I. During college, back in the '70's, she and I dreamed of hopping the rails (as per the OP's article), but did hear how dangerous it was......and neither of us was into any forms of alternative lifestyles. We just wanted to see the world before settling down at the ripe old ages of 24.
So, as most grads did back then, we found jobs in our fields. To celebrate we each bought a one-month Ameripass, allowing us to travel anywhere we wanted by Greyhound for a month. We did it in the summer of '76 (with our obligatory backpacks), the Bicentennial. What a blast: 4th of July fireworks over North Platte, NE; standing at the Lincoln Memorial watching Elizabeth II and Prince Phillip walk by; showing up at Grand Central in NYC at 4 AM. The adventures went on and on.
Now we listen to Rick Steves and enjoy his recs. But we're also getting interested in Globus (who does all the planning and "hard work" of a trip).
We used to think we were adventurers. Now we are just tired and need a vacation.