Song meaning of 100 Years by Florence + the Machine

Well, 100 Years by Florence + the Machine sounds like a love song mixed with a plea for world peace... or something like that. Florence seems to have a ton of faith in her love for her significant other and in love in general. She's not afraid of the dark, in fact, she embraces it. She believes in shining a light on hate and making the days never turn into night, like ever. Not sure how that's possible, but okay. Then she talks about how they don't need to fight, and instead raise their voices and let their hearts take flight. Is she talking about flying planes or something? Anyway, she wants to be held lightly and prayed with which is a pretty specific request, but hey, who am I to judge? Then she talks about funerals, bleeding youth, and women raging which is a bit of a mood change from earlier and finally ends with a plea to not let her break this love thing she's got going on. A hundred arms, a hundred years, she'll always be there. It's like a Lifetime movie on steroids.