I stand by it, I dont think it is rude.
I think it highlights the focus we as technology advocates hold that technology can solve society based problems. Turn back the dial 50 years, we held our elders in far higher respect than we do today.
That said, I want to show you an example of something a bit more meaningful with skype and the older generation.
http://www.bbc.com/news/technology-17870178
Clearly this is not for all people, yet I feel it is more interesting than just to ring up and hold a "30 minute" conversation because someone is paying you to do it. Not only that but I would bet it gives some of these ladies focus, purpose, still have something to give to society.