When I can't act I am unfree. Self-confidence enables me to act. Freedom is self-confidence. Lack of time enslaves. Life-extension provides more time.
Freedom is time.
To do what I want to, I need space in which to do it. Imprisonment is being confined to a small space. Imagine a future time with human colonies in space, on the Moon, and on other planets - and considerable space travel between them. Freedom is space. According to the best evidence available to me, if I die I lose all freedom - all my options have expired.