Great ending. This series got better as it went on in my opinion. I loved how she was able to revert the world back to normal and wipe out all of those who had outlived their stay. I like how the Opt outs couldn't get the virus- justice for them not having taken longevity in the first place.
I LOVED how albert was actually pip. That was a twist I was not expecting- so perfect though.
And lastly, I love how the last chapter was from young and naïve Molly's point of view. It is amazing how she noticed the formula was actually on the ring, when no one else had (or had they just pretended not to notice so that the world could revert back to its natural order?)