What exactly does that mean-"Only the good die young"? It seems to imply that everyone dying young is good. What about senior citizens? Are there no good among them? I don't subscribe to this way of thinking. I believe that dying is a part of life and your time on Earth is predetermined. The good, the bad, even the ugly will go at the appointed time.
Besides, who gets to determine what is young? Does young mean "before adulthood"? Does young mean "younger than me"? While young might determine innocence, I don't think it determines goodness.
And speaking of goodness--how do you decide who is good and who isn't? Based on what--outside appearances? What YOU see of the person? Unless you spend a lot of time with someone, do you truly know them? ONLY God can "search and know."
It's best for me to try not to make sense of God's work. It's not for me to be all knowing. I realize that some things are beyond my understanding. In those instances, my prayer is for acceptance of God's will.