It depends on what you are looking for in a "mature" provider. To me, it is more than just that a person (provider or otherwise) has reached a certain age. It means that the person has learned how to handle themselves, has good judgment, and that there is minimal drama associated with that person.
Back to the original poster's point. Classy Monica has a great body and an even better personality. Although I haven't seen her myself, Chloe Belle also seem to fit the bill.