If they are documents which you created, were present when they were created, and/or have been in your custody for all those years, you can probably authenticate them. If you have time before the hearing, there are methods in discovery to assist in this regard such as requests for admissions and/or getting the opposing party to make admissions about the documents in the course of a deposition. The judge usually has very wide latitude and while we cannot go into all of the rules of evidence and their exceptions, these are a couple of ideas which could help. If the issues are important you should consult with local counsel.
If you prepared the documents and recall doing so (or they refresh your memory as to doing so) then you can authenticate them, regardless of their age. However, while they may be authenticated, and thus admissible as evidence, this does not preclude another party from arguing that while they are admissible, they are not credible - mainly for the same reason that you can authenticate them in that you created them.