People over 30 hate cell phones
blogs.computerworld.com
blogs.computerworld.com
The essence of the research the article is, badly, paraphrasing is that people over 30 find the number of features on cell phones intimidating. This includes feature as simple as text, the phonebook and voicemail.
A good friend of mine used to work at Vodafone in a product department some years ago. Back then they were talking about launching simplified phone for older people, I'm surprised we've not seen more in this direction.
I think launching a phone that did the phonebook, voicemail and text incredibly well would sell like hotcakes. My mother (62) recently bought a new phone based on the size of front for the ABC, DEF, etc on the keypad so she was able to text.
I would suspect the iPhone market is targetted at 18-40 year olds (though more heavily in the 18-30 range), while blackberry is working on 30-50 range.
Just like most technology, the younger the user, the more features they are going to use. But saying 'Over 30' is pretty meaningless.