Simply do a tug test to see if it's okay.ive used plenty of threads that were 20-30 years old and just fine, I've had thread that was brand new be ( bad). It depends on lots of things. Yes, thread can deteriorate.it all depends on how it was stored, humidity, quality in the first place...
take a piece 12" or so long, wrap it between your two hands & give it a tug- if it doesn't easily break it is fine. I test every spool of thread, new or old before using. I hate starting a project and dealing with frequent breakage because it is not strong enough. I've had new, expensive thread wind up being unusable ( which I returned) and old thread work great.