Regarding your age, you should not be concerned about an imaginary cut-off age. However, you should make sure to portray the progression you have made throughout your career.
For the GMAT, you may want to consider taking the test again as the average scores continue to increase. As an example, HBS's average GMAT score increased from 720 to 730 last year. Your GMAT score is self-reported on your application, so admissions teams will only focus on your highest score.
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MBA blogger, US News and Author, The MBA Application Roadmap