Both mature in reverse.
Turritopsis nutricula is a hydrozoan with a life cycle in which it reverts to the polyp stage after becoming sexually mature. It is the only known case of a metazoan capable of reverting completely to a sexually immature, colonial stage after having reached sexual maturity as a solitary stage. http://en.wikipedia.org/wiki/Turritopsis_nutricula
Benjamin Button in the short story by F Scott Fitzgerald and in the recent motion picture starring Brad Pitt was born old aged and reverted to a child as time passed.
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