A process of refinement. It is not about age or infinite youth. Rejuvenation is about curiosity, creativity and exploration. Characteristics which keep us young in our mind, heart and soul.
To rejuvenate ourselves we need to let lose the things we hang on from the past. Get rid of possessions, thought patterns, procedures. Stick to knowledge, basics for survival. Become interested in things around you.
Notice the landscape, read unknown authors, feel new emotions, follow obscure thoughts. Welcome creativity and stay curious on this new way and you will be rejuvenated and gain a new horizon.