Should leadership have an age limit?

Does leadership have an age limit? It’s a question worth pondering these days as more CEOs find themselves unwilling to loosen their grip on power, writes Fortune ’s Lila MacLellan .?

In the political realm, there’s 80-year-old incumbent presidential candidate Joe Biden, the oldest sitting president in history. Donald Trump, his likely challenger, is just three years younger.

In the private sector, there’s Warren Buffett, the 93-year-old Berkshire Hathaway founder and CEO, who recently told investors that his named successors wouldn’t step in for many years. Then there’s media tycoon Michael Bloomberg, 81, who stated this month that he hopes to keep working for at least three to five more years.

Last week, news of Rupert Murdoch’s departure from Fox and News Corp’s boards grabbed media attention, though the 92-year-old made clear that he will still be actively involved in the business.?

The average U.S. lifespan has increased from 68 in 1950 to 76 today, and it’s become clear that boomers and Gen X workers can and will stay in their jobs far longer than their parents. Aging leaders face a moral quandary, MacLellan writes . What happens to a company’s performance and its employees if a CEO has significant cognitive or physical decline?

And even if a CEO is perfectly healthy, their unceasing presence at the top can demoralize top talent who see no pathway to the corner office or can lead to complacency, stalling innovation.

To be sure, older CEOs need not step down as soon as they hit a certain age threshold. In fact, older leaders confer experience, lessons learned, wisdom, and emotional stability, research shows.

Perhaps Jim Citrin , head of Spencer Stuart’s North American CEO practice, says it best: Stop using age as a marker of capability. “Use passion, energy level, health, vitality, adaptability, motivation,” he advises.

Are you still eager to learn and experiment? Are you quick to change what isn’t working? Do you have a growth mindset? These are important predictors of effective leadership, MacLellan says.

Leadership Tip of the Week ??

It’s important for leaders to be self-reflective, says Verizon CEO Hans Vestberg . To achieve that, he ranks his mood from one to 10 daily—a practice he’s kept since 2009. The sweet spot, he says, is a score between three and seven. A one or two means he was not in the right headspace to collaborate a day earlier and should work alone during the coming day. A score over eight means he had too much energy, which could actually drain his colleagues rather than engage them.

Leadership Next

Best known for his 23 year stint at Amazon, supply chain superstar and Flexport CEO Dave Clark is now on a mission to transform shipping company into an end-to-end supply chain platform.

In this episode of Leadership Next, Clark joins host Michal Lev-Ram to reflect on what elements of Amazon's culture he is bringing to Flexport- and which elements he isn't. Additionally, he shares his advice on building a team to lead the business you want, rather than the business you have.

Listen to the?episode ?and?subscribe ?to Leadership Next wherever you listen to podcasts.

Those are our biggest leadership stories of the week.

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-Ruth Umoh , Fortune’s Leadership Editor