Wither, by Lauren DeStefano
At the age of sixteen, Rhine only has four more years left to live. Two generations ago, scientists found a way to create genetically perfect humans, impervious to all known diseases or mutations. But something went wrong, and the children of this first generation of perfect humans die inexplicably at a very young age: girls at the age of twenty, boys at the age of twenty-five. Geneticists are racing against time to find an antidote, but as the first generation dies out, the world is full of poverty, starvation, and orphans hoping to find some meaning before they die before their time.
