Indeed. I occasionally wonder what I'd be doing if I had been born a hundred years ago. I figure at best a stockbroker, more likely an accountant doing lots of manual arithmetic.
// Some in the IT field would have been selling snake oil, because they do it today.
I find that similar to programming: designing and improving a project in iterations, understanding how things work by analyzing their internals, remembering processes that work, etc.
So I guess that 100 years ago I would have been either into mechanical or electrical engineering or some other more traditional skilled work like carpentry.
As for what I would be doing, likely a farmer, as that is a job I still do today. Though I'm not sure I would want to give up some of my modern conveniences.