First, an apology: I shouldn't have gotten personal about this. I didn't really think that bryant was fishing for clients, but it just seemed like such a comment so out of the mainstream, that I thought it needed to be questioned. Still, my comment wasn't remotely called for.
That said, I agree fewer older students apply for an MBA. No question.
But I guess the question is whether that accounts for it all. If Columbia has a median and mean age of 28, and Harvard 26 (guessing here), does that mean the applicant pool for one is skewed older than the other? Other intervening factors are possible, of course: Columbia might prefer industries that feed MBAs at an older age than Harvard, for example.
And I agree that it is unlikely Harvard or anywhere else explicitly makes an age determination. But given the realities of the achievement standard... sort of a "the more you do in the shortest period of time" kind of thing is that older people will have a harder time.