They all do pretty much. Some schools skew younger and some skew older, but at 33 you'll be outside the middle 80% at virtually all top b-schools (i.e. less than 10% at virtually all the top schools are younger than 31 at matriculation).
However, age alone won't be the determining factor. If you're a non-traditional applicant (military, nonprofit, arts/sports, etc.) then it won't be an issue. If you're in engineering, finance, accounting, corporate, etc. then it will be a handicap.
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