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Turnabout (original 2000; edition 2002)
References to this work on external resources.
Wikipedia in English
Amazon.com Product Description (ISBN 141693653X, Mass Market Paperback)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....
(retrieved from Amazon Thu, 14 Apr 2011 07:05:24 -0400)
After secretly receiving injections at the age of 100 that are meant to reverse the aging process, Melly and Anny Beth grow younger until, as teenagers, they try to find a guardian to take care of them as they return to infancy.
(summary from another edition)
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