expiration dates

Yesterday, my mom pulled a bottle of green ketchup out of the fridge, wondering how long we had to keep it for. i honestly can't remember when we even bought it. we wondered if it had expired, or if ketchup didn't expire, and what to do with it. should we throw it away, even if it's still good, if it no longer serves a purpose? or should we hold onto it, despite our concerns over its worth, just in case we come to a point in life when we need it? in life, in our relayionships, should we hang on "just in case", or does everything, at some point, have an expiration date that we should observe?