I recently read about a Twitter user who just turned 104 years old! British woman, Ivy Bean celebrated her 104th birthday and is probably the oldest Twitter user. Ivy was actually more active in Facebook before using Twitter and prefers Twitter over Facebook because she says it's just updating and is a lot easier. Ivy has about 32,454 followers and basically tweets about what she is doing. She lives in a care home that encourages their residents to be active and her frequent Twitter-ing has gotten her a lot of media attention, getting asked to be interviewed from news outlets all over the world.
I think it's really awesome how people of all ages can embrace social networking, not just the younger crowd, as many may think. It's untrue that older people can't get into using social networking, as Ivy Bean has proved to us all. :)