Immortality... Or, better, eternal youthful vigor.
I'm tempted to take "low expectations" so that I could enjoy it fully, but I'll go with Sorcery as a second superpower - that's broad enough to be useful. It could be one of any number of systems, but preferably one that involves naming the effect and having it happen within some sort of reasonable limit.
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Light a man a fire, and he will be warm while it burns.
Set a man on fire, and he will be warm for the rest of his life.
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