Most of them posses some skills that make them possible to work any where any time with some basic tools, such as a computer, printer, phone and internet, etc. They can be writers, photographers, musicians and online marketing /consulting experts. Some young people are work- campers, that means they don't have savings or skills to sustain their traveling life style, so they pick up part time jobs along the road.
Most of them live in RVs and boats, travel wherever they like. Either to chase 70F degree year round or to see the natural beauty this great planet offers. It's not that expensive when you only have to buy gas and food and camping sites can be cheap, sometimes free.