I'd doubt it, but it can't hurt to try.
It's key to remember that age isn't necessarily a good mile-marker for whether or not something will be declassified. After all, legacy systems like that stay classified as they may still be in use with allies. When time comes around for them to finally retire them? So much time may have passed that the system itself is relegated to obscurity and thus remains classified not out of intention but rather apathy.
Still can't hurt to ask.