I can understand that such an account created back in 2011 has some kind of sentimental value, but it would have even more if it generated some kind of value in terms of posts that don't actually exist. Will such an old account mean something special even if it manages to rank?

Maybe it will be the case for some who will consider it as proof that the OP is one of those early users of the forum, but I think that in this particular case the date of account creation does not have much to do with what will happen with this account in the future.