Not type related, but interesting enough. I figured INJs would start life early somewhat detached/in their "headspace" a bit. Not to say they wouldn't make up for it or lack wisdom. When I think of "life wisdom" though, I think someone who's out there experiencing a lot.. has homespun wisdom. Like Zorba the Greek. An EP at least.
Actually I think each type can develop their own sort of wisdom, from the perspective of their own personalities and how they accumalate and process information. So its not a matter of who has more, but a matter of who has what kind.