I'm an outsider. But sometimes they see things insiders don't, or don't want to. I'm an economist, and in my reading of economic history, I have yet to hear of a skill that always stayed applicable.
Being able to do various forms of maths (e.g. geometry) has been a useful skill for literally millennia.
Being able to drive has been a useful skill for about a century. The number of people who need this skill has probably peaked in developed countries, but is rising globally.
A lot of basic computer and networking technologies have been around since the 70s or even earlier and the pace of change has slowed a lot since then.
