> Today, people embark on careers in their 20s that disappear in their 40s and 50s. Such a pace of change is distressing. Consider how many people drive trucks for a living. In another generation, that job will be 90% wiped out.

I am having a hard time coming up with areas where careers come and go in 20 years.

Truck driving isn't one, it's been around since the 1930s and only really aggressive predictions suggest its passing by 2030 - which is more than long enough.

It would be more convincing to name careers that had both come and gone, rather than which are scheduled to go soon. But everything I think of is more properly categorized as a sub-type of a larger career. Punch card operators and VB6 programmers aren't tied to those technologies, they are generic computing professionals who happened to use a technology stack which has gone away.

Can you think of any examples of complete career fields which have disappeared?