It is not completely impossible to get admission in a decent school for Full time MBA with your age. But, but, there are only very few schools who will dare to admit you. The reason is simple, they are not very confident to place you. In reality, only a very few decent schools actually admits aged people (35+). 30-35 is still doable in quite a few good schools but after that your school options are very limited. Some school will flatly tell you that their average class age is 28, some will indirectly encourage you to join executive/fellow and some will not tell you anything.
Executive MBA, part time MBA, fellow programme, blah blah should not be an issue.
But the question you need to ask yourself is why MBA? what you planned to achieve and how so and so school/programme will help you in achieving that?