I'm torn about how to end my story? (easy ten points)?

Basically, all you need to know is that the story is about 6 teenagers who accidentally transport themselves ten years into the future with a time machine (i know, it sounds like a sci-fi story, but it's not. really) But it's not like back to the future, more like thirteen going on thirty so they're not kids who got transported there, they're lives have been fast forwarded and they're adults now. Anyway, long story short, I'm torn whether or not I should bring them back to the past in the end. Near the beginning, that was the main goal they were working towards, getting back, but slowly, they've adjusted to their new lives and they've even sort of started forgetting sometimes that they're really just kids. On one hand, I think it would be kind of cool to see them accept their new lives and be happy with them, but I also kind of want them to go back. I feel like that would be a bit disorienting though because they're in the future for over a year and then they're just supposed to forget about it? And also, there are three children that may cease to exist if they go back to the past because if they do one thing differantly, they may not have their children. One character's girlfriend dies of leukemia though so he'd get to see her again if they went back to the past. But also, two characters who are dating in the future wouldn't be able to date in the past because of the age differance. I'm just not sure what to do. What would you do if you were me and why?? I'm going to make the decision myself in the end, but your input could really help me out with this. Thanks in advance.