USA, Canada / I have an OLD Polish passport (live in the US now) [13]

I left Poland as teenager in middle 80s. Never really had the time or need to renew the passport and when traveled outside, I used US one.

So now, I have the "old" long time expired passport and birth certificate and really nothing else. Since the systems have changed, is it worth all the trouble to renew/replace the old passport ? I am not too far from Chicago but if I need to get a lawyer and pay excessive fees, I probably would not do it. Anyone has experience as such ?