1 more year on the age-scale won't change your odds at S but the almost 1 yr more of preparation will indeed improve the quality of your essays, profiles, and warchest (i.e. money). Besides, S is not the only elephant in the jungle, you know after all there are seven schools that make the M7. Great schools such as Chicago and others are more okay solely on the age issue. Hedge your bet and apply later in 2011 cycle.