Who can replace you, love while you're young, what does it mean?

Who can replace you, love to your heart's content while you're young is the lyrics of "I want to sing me to you", which expresses: let's love to our heart's content while we're young, because no one can replace the feelings we experience. It's a song that reminds us not to let time get out of our grasp. It reminds us that time is precious, and so is love, and that we should take hold of it, and have love for ourselves in a precious way, instead of letting it pass. Because no one can replace us, make the final decision, no one can replace how we feel. So, while we are still young, let us grasp love to the fullest, to experience love, cherish love, let love in our lives more perfect.