The same. As we age/get more mature, we learn how to use the other letters, but our core self doesn't really change. As an example, as an INTJ, when I'm playing and having fun with friends I appear to be an INTP. When I'm leading a group or running a project, I appear to be an ENTJ. When I'm doing financial and spreadsheet stuff, I look like an ISTJ. When I'm having a heart-to-heart talk with someone, I look like an INFJ. So along the way, I learned how to use all the letters, but am still an INTJ at my core.