Originally Posted by Bill Kapaun

First thing is measure your chain.
I like to measure a 3' section if i have the chain off the bike. It reduces the human error to 1/3.
Wear up to 1/16"/foot is considered acceptable.
At 3/32"/foot, time to replace.
IF the chain is good, it's a promising sign for the cassette/or FW being good.
IF excessively worn, probably not.
Chain rings last much longer, but if the other parts are excessively worn, they will wear much faster.