We're guessing anywhere from 1.5 to 2 years. Her teeth look really nice and white, but her body says she's done devolping and is an adult. I don't know why no one's interested in her as she's the easiest going Pit I've ever had. I like high drive dogs so I always end up with problem children or ones that need active, really Pit savy homes. She's so low key, well behaved even with out any formal training, is good off leash and LOVES other dogs.