Social network services users have gone from being classic early adopters (i.e. Male, highly educated, young to middle-aged, urban) to become every man and woman – with a continued skew towards youth and as diverse, if not more than the internet-using population.
This doesn’t mean that more older adults aren’t flocking to social networks, they are, but younger adults are also still using these networks, so the overall representation of the age cohorts in the user population has actually gotten younger.
I think that is trying to say is that you are now getting all types of younger people using these networks, which is keeping the age profile young, however, you are also getting a lot of older users who are coming from a limited profile of society. Why don’t you download the presentation and make your own mind up.