Actually I don't think age is a major issue, as long as you can prove that your career objective can best be achieved with an MBA, and that you have comparable (or higher) energy level and learning potential as younger students, since both b-school life and life after b-school are very fast-paced and full of intellectual challenges.
An good article talking about evaluting decision-making by process, not the outcome. The speaker is Robert Robin, the former Treasury Secretary of US. Hope this article is helpful to you. by the way, age, definitely, would not stop you realizing your plan.