I'm playing with ideas for a magical world in which everyone is born with a fixed (typically very long by our terms) life expectancy that they are aware of at all times and can (theoretically) bring about anything they desire through magic. Of course, there are limitations: All magic has a cost, and the cost is that it reduces the caster's lifetime. Particularly difficult magic might need many people's lifetimes, so could only be done by a team effort. People get more efficient at doing particular magic through practice. There is a sort of "conservation of magic" in place. It's sort of possible to use magic to extend your lifespan, but for a novice it would cost about 3 days to add one day. With extensive practice it might be possible to add a day at a cost of 26 hours, but the caster always ends up losing out. I've a fair bit of thought into how economics and politics would work. Much of it would look like the real world: we already give up part of our life for work, and some of the benefits we get for that go in taxes. Potential issues like race would not be issues at all because people could change them at will. What I'm struggling to work out is how gender would play out. Of course, people could change their biological sex, with a moderate expenditure of magic -- far less trouble than gender realignment in the real world. And yes, I expect adolescents would experiment a lot, and do things they regret later in life. And yes, there would be a system of laws and sanctions, and flipping your love-rival's sex would get you in a whole heap of trouble. As a middle-aged male that's pretty comfortable in my body I probably wouldn't change much if anything. But I'd be interested in what others might choose to change about themselves. I'm particularly interested in views from women and from gender and sexual minorities because they're completely unrepresented in my present sample of one! Also, do people think that gender politics as we see it would exist? Could there be an equivalent of GamerGate? Might there be pressure to "commute" to a particular gender for some jobs? I'd be interested in thoughts.