the "first kiss" part of the song is definetely just a metaphor, so it definetely doesnt have to be your first kiss that it relates to. it could be someone you met when you were 25, and it could still relate to you. and looking back on it, you will always love that person, but you didnt end up together. you're both okay with it, and you know that the love will never die.
i totally agree with whoee, but besides that:
the "first kiss" part of the song is definetely just a metaphor, so it definetely doesnt have to be your first kiss that it relates to. it could be someone you met when you were 25, and it could still relate to you. and looking back on it, you will always love that person, but you didnt end up together. you're both okay with it, and you know that the love will never die.