They're escalating levels of technical skill, as defined in the linked article. I see no indication that there should be significant overlap.
While young adults might be better able to e.g. use Gmail, I'd be willing to bet most of them can't configure and recompile DWM, modify the gtk3 settings.ini by hand, or make changes to their xorg.conf.
And by selecting upon adults, the numbers are already driven up. The young tend to be more skilled with new technology than the old.