You're going to be a stretch because of the fact that you have a PhD (in something other than life sciences, which is what most MBAs with PhDs tend to have) and your age.
Also, keep in mind that adcoms have seen many folks like yourself (not necessarily PhDs but those with a very strong academic/quant/analytical/technical background) who completely misunderstand what an MBA and what business is all about - that an MBA is simply an extension of their technical education to date, and that business is just like their technical jobs, except it pays more.
And that couldn't be further from the truth.
Business is ultimately about your ability to manage and lead people, to supervise people, to be able to build relationships with customers and clients and investors and partners, to be a great team member, to understand group dynamics. It's about one's interpersonal skills, leadership ability and communication skills - basically the kinds of skills and experience that many people with technical/academic backgrounds are weak in.
So your challenge is to convince the adcoms that your interpersonal/leadership skills are as strong if not stronger than your already exceptional analytical/technical abilities. If you can't, you'll have a tough time getting into a top program because there's enough applicants who will be able to show that they have these skills (even if they aren't as analytically/technically brilliant as you are).