The Wharton School of the University of Pennsylvania, belongs to the Ivy league and is based in Philidelphia. Like other US programs the average age of admission to Wharton is young, mid to late 20's, and the MBA is offered as a 2 year course. Wharton has consistently been ranked highly by all the major ranking publications and has a good reputation for gender balance & post-MBA career success.
Other top-tier international business schools on the US East Coast include the Tuck School of Business (Hanover, New Hampshire), Duke University's Fuqua School of Business (Durham, North Carolina) and Georgetown McDonough School of Business (Washington DC).
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Why not have a quick look at The University of Chicago Booth School of Business