As far as the birds are concerned, do black oil sunflower seeds go bad?

I found a bag of these (opened) in my garage. I bought it last year, then forgot about it after I used it once to fill a feeder. It was on a shelf, not close to chemicals or anything, since I don’t keep those in the garage.
I will feed it to the birds (cardinals seem to like them) in my feeder if it is OK. Is it OK? Seems like it would be.