You have to continue to differentiate yourself at each stage in your career. Regardless of your age, at every point in your life, there is a younger person eager to step into your job. If you are 30 years old, there is an impatient 20-something coming up on you; at 40 there is that pesky 30-year-old. One 60-year-old CEO told me about a 44-year-old knocking on his door to take over the company—his own son!
When you want something you've never had, you have to do something you've never done. Whatever your age, job situation, work history, or family way, turn up the juice going forward. Do it now, do it for your team, your company, and yourself—that is, unless you are ready to give up. But if you are like me, you aren't about to give up. You must realize that personal reinvention never ends whether you have a little gray hair or no hair.