I think there is an important detail not considered.

With age comes wisdom (I hope), and I think as you get older you are more likely to have knowledge to impart on others. It's a basic knowledge cycle really.

I admit I'm not one to participate in answering questions often on communities, and more likely to be the one asking questions, but this isn't due to an attention span, or excitement about technology. It's due to the fact that I'm still learning and growing. As I become more experienced I hope to be able to help others as well by passing on what I have learned.

Also I think there is a difference on what work Gen Xs are doing compared to Gen Ys. I'm not sure how Gen Xs have the time to response so quickly to questions. By the time I get to reading a post, there are already experienced people who have responded.

For the record (if it really matters), I'm a Gen Y, at least on the cusp of it anyway according to the wiki posts.