What does Johnny mean when he says “stay gold” right before he dies? Answer the question in a RACE response.

Johnny encourages Ponyboy not to waste his youth looking for things he does't have. He tells Pony that life is fleeting and nothing is permanent hence "Nothing Gold can Stay". Johnny encourages Pony to see the goodness in people like Darry instead of wasting their relationship. He wants pony to stay innocent and good as long as possible.