Margaret Peterson Haddix _ Turnabout

In the year 2000 Melly and Anny Beth had reached the peak of old age and were ready to die. But when offered the chance to be young again by participating in a top-secret experiment called Project Turnabout, they agreed. Miraculously, the experiment worked — Melly and Anny Beth were actually growing younger every year. But when they learned that the final treatment would be deadly, they ran for their lives.

Now it is 2085. Melly and Anny Beth are teenagers. They have no idea what will happen when they hit age zero, but they do know they will soon be too young to take care of themselves. They need to find someone to help them before time runs out, once and for all….

_goodreads_