If any athlete had the right to call it quits, buy an island and relax, it's Roger Federer. But no, instead of cruising towards retirement, Roger demonstrates the challenging skill of reinvention.
In Kouzes & Posner's "The Leadership Challenge" one of the core 5 leadership practices is to "Challenge the Process". From a leadership perspective, this often is seen as challenging interpersonal, team, and organizational processes, norms, etc. It is just as important, and perhaps even more so, to challenge our own processes toward self and professional development—taking a critical look at all of our strategies, techniques, and tools to identify what is needed to raise the bar—at any age or life arena.