Robert Greene's Principle 2 of the "power game": your position of power is never stable — at any given moment it is either increasing or decreasing, and more likely decreasing, because younger, hungrier, more energetic and creative competitors with less to lose are constantly emerging. This dynamic instability holds "until the day you die."
Framing: decline is structural rather than a personal failure — you are "more likely" losing power than gaining it simply because new entrants keep arriving, not because of anything you did wrong.
Practical implication: treat any position you hold as more likely eroding than fixed; the correct posture is continuous adaptation rather than resting on an achieved title.
See Winning the Power Game Is Mastery, Not Position for the related claim that the goal is adaptation itself, not the position being defended. See also Power as Managing Appearances (The Aura Game) and Status as Relative Standing (The Real Attractor Behind LMS) for adjacent framings of power/status as relative and perception-driven rather than fixed.