I've been another one of those lurkers who got into a program for this year but still receive email updates, and I wasn't going to come on or comment until I saw the threat start to mention ageism. For what it is worth, friends on both ends of the spectrum, I got into a top program in NYC and I am in my mid-forties, and several of my classmates are under 25. I do think that, in the end, it's about the quality of your writing sample, at least for school admissions. After that, we're in another ballgame I suppose.
Anyway, good luck, all.