Most likely not. I'm not quite sure exactly what you're trying to say; however, you're probably not too far off. You probably just need to use a different word or two. The only context I can think of where this would make sense is if you were talking about someone's personal growth. Most likely someone's mental growth. "He came here a child. A year later he left as an adult." Something along those lines is where I would most likely use a phrase like that. I doubt you are talking about someone's mental growth if you are still learning a language. I could be wrong, though.