Re: [Magic] powered by youth
While it didn't age you in the book Druid's Blood by Esther M. Friesner there is a fixed mana pool for mages. Since one thing magic could do was keep you from aging or make you younger every spell cast on anything else was shorting what could be a very long life. The royal family was mages and would use magic when needed to defend the realm but abdicated after a while and retired to live a long and peaceful life.
I have though about using it in a campaign but never had the right rest of the setting in mind. One problem I can see is that players are much more willing to kill off a PC to "win" the the actual PC would be.
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