[bb88]

Assuming that what you're saying is true -- (not ai) and I'm not sure it is. The big difference could be that kids get computers for school now. I used pen and paper to take notes, and I didn't sit at a computer for 8 hours a day until my first job in the 1990's. I'm sure that's true for a lot of people.

It's possible people have "grown into" a keyboard better than the previous generations did.

Further, before the 1990's there was a secretarial pool where managers would send documents to get typed out. Sometime during the 1990's the pool went away and people were expected to type their own documents up. Sure they could create templates now with WordPerfect, say, but the idea is that the keyboard became more and more present in an employees life around that time -- so hence more likely to get carpal tunnel.