Calculating the aggregate age of all facebook users is irrelevant since the only people who matter to you on the site are your "friends". So my 15 year old cousin's friends are mostly her real world peers and her 45 year old dad's friends are mostly her peers. While there is a tiny overlap, it wouldn't be considered significant.
It isn't like a bunch of old people are now trying to hang out with the young cool kids causing the entire system to be less cool.
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Calculating the aggregate age of all facebook users is irrelevant since the only people who matter to you on the site are your "friends". So my 15 year old cousin's friends are mostly her real world peers and her 45 year old dad's friends are mostly her peers. While there is a tiny overlap, it wouldn't be considered significant.
It isn't like a bunch of old people are now trying to hang out with the young cool kids causing the entire system to be less cool.
That compartmentalization is what makes Facebook such a neat social site.