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If I found a magical stone that could keep one person young forever, I wouldn't give it to anyone OR keep it for myself. I would hide it away where no one could ever find it or use it.
Think about it - being young forever, in our society? Not all it's cracked up to be, especially if you're the only one. If you were young forever, you could never fall in love, have a family, have a career, anything. No life insurance, that would be interesting.
Just think: you have a magical stone that keeps you young forever and, I presume, keeps you from dying from various diseases, accidents or attacks, fatal wounds, etc. But in our society you had better keep such a thing a secret, or it wouldn't be yours for long. And I'd assume that if you lose the magical stone after, say, a thousand years - you would just turn to dust, as you should have been all along. So you'd better not lose it unless you plan on dying.
And you can't do any of the things that make living worth-while. Fall in love? Even if you tell your beloved about the magic stone, and they're okay with that, they will grow old and die while you stay forever young. Your children will look older than you, die before you. Your grandchildren? Also going to grow old and die and leave you behind to mourn. You can't have a career - because eventually people start to notice when you've been with the company for thirty years and you don't look a day over twenty-five, or whatever. People will eventually start to ask questions, and that brings you right back to losing your magical stone to someone else. Even if you hop from one place to another, the government (and your life insurance company) will eventually figure out that you've been a citizen for over a hundred years, got your centennial birthday letter from the president, and you're still going mountain-climbing or whatever. Kinda weird.
You would have to constantly be changing your name, changing where you live, creating a new identity and a new life for yourself every few years, or hiding out, either somewhere that doesn't ask any questions about weird stuff like immortal youth, or somewhere that has a transient population that wouldn't notice.
So all the cool things about being young? In a society where one person being young forever is NOT the accepted norm, you wouldn't be able to enjoy it. For a while, maybe, but after a few decades it would only be torture. I wouldn't wish such a thing on my worst enemy, let alone my dearest friend or myself.
For fictitious reference, see Jack Harkness from Torchwood
or, as anhtho
has reminded me, the Tuck family from Tuck Everlasting