RE: Expired creatine?
Creatine is a dry chemical. It's very unlikely that it would change chemically over time.
There was a study done on prescription drugs, to determine if the expiration dates actally meant anything. Only a few of the dry drugs showed any change in effectiveness over time.
Has anyone actually studied this for creatine? Probably not. The drug and supplement companies want you to throw out anything old and buy new.
If it were me, I'd take it and not worry about it.