The most important thing for you to do as an older candidate is a) to prove that you have advanced high and fast in your career, thus showing that you have the capacity for deep and true long-term leadership in your industry b) provide goals that make sense given your position and age, but at the same time are ambitious. c) show them in a very precise manner that you can reach goal xxxxx, if only you just had their MBA.
As an older candidate, schools can be less interested in you because they feel often that if you were destined for success then you should have it already with or without the MBA. that's why it is soooooo important to SHOW them the above things.
Additionally, if retaking your GMAT is a possibility, and you believe you can do better, I would suggest doing so, as both INSEAD and Kellogg have average GMAT scores which are many points above your score, and you want to give yourself any advantage you can get.
hope this helps!
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