Most software is still very complicated for older people. I recently helped my 90+ grandfather download a Word document attached to an email, edit the document, print a copy, and reply with the edited version attached. You would not believe how much prerequisite knowledge this takes for someone computer-illiterate.

I think there is a big hole in the market for software that is designed to be as easy as possible at the expense of power/flexibility. The article talks about people 75+, but I think the cutoff where a majority of people have a hard time with computers is younger than that. I bet that someone who really tried hard to make an integrated suite of senior-friendly software would do well.