Hope is 14. The other chararcters are: Lightning 21, Sazh 40, Snow 21, Fang 21 (+ 500), Vanille 19 (+ 500), Serah 18.

While I thought there was some interaction between Lightning and Hope, I don't think they become a couple... at least not yet. Maybe 5-10 years after the game's events. I'd still see Hope and Vanille as a more likely couple if it wasn't for (SPOILER)Vanille being crystallized.