299G: They grow young as they age

I am looking for the name of a book I read close to 20 years ago as a child. It’s one of the books that made me fall in love with reading and I’ve never been able to find it. Some of the details may be off as it was so long ago but- a brother and sister somehow end up on a far away island. And while they’re there they realize everyone has great respect for the children and the children are very well spoken and wise. But these people it turns out are born out of caves old, and they grow young as they age. That’s about all I can re-call. Thanks for your help!

2 thoughts on “299G: They grow young as they age

  1. This has to be OTHERBORN by Joan Gault (1980):

    “A boy and his sister, separated from their boat, come ashore on a Pacific island inhabited by a race of people with a radically different conception of birth, aging, and death.”
    and see the brief book review from BOY’S LIFE here:

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