Outsiders Question

I believe the poem means enjoy what you have while you have it, like family members and friends. Like the line "Nothing gold can stay", I believe it means everything fun doesn't last long so enjoy it while you have it. This fits into The Outsiders for a couple people, like for Johnny. He needed to enjoy life while he could because right now he's fighting just to live. Even if he does live, then he will be crippled from the waist down and should have enjoyed walking when he could. This also works with every other member of their gang, because they need to enjoy each other while they can, because two of the are in the hospital and one might not make it.