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soon. Russia's ; India's , while China's is the youngest of the rulers of the major world powers.

None are planning to retire.

Brazil just elected a 77-year-old as its new president, while Israel's incoming prime minister is 73. As younger men, both Luiz Inácio Lula da Silva and Benjamin Netanyahu . , is reportedly about to announce that in 2024.

One reason for the gerontocracy is that those who assumed power at younger ages in non-democratic countries have amended constitutions and rules to allow unlimited terms of office. In Russia, Putin has ruled uninterrupted for 23 years, while in China, Xi has ensured unlimited years of rule for himself.

In democratic countries, older politicians draw on decades of political capital and alliances. Biden's success in running for president was partly due to the fact that he convinced voters that his 36 years as senator and eight years as vice-president would benefit America. in the mid-term elections may suggest he has a point.

Like Biden, older leaders often promise continuity and stability. In a world beset with daunting problems—from climate change to pandemics and inflation—a capable leader, particularly of a major power, is often seen by citizens as someone who has a track record. Those with many years of political experience argue they are best placed to deal with what lies ahead.

Challenges faced by novices

The sorry tale of Liz Truss, Britain's prime minister for 44 days earlier this year, shows how quickly and furiously the .

Curiously, western Europe, the region with the largest proportion of older citizens ), has the youngest leaders. France's Emmanuel Macron, in his second term, , while the United Kingdom's . German Chancellor is the oldest leader of a major European country.

The phenomenon of younger leaders but a graying population in Europe is due to some extent to the unique politics of many countries in the region. Nearly all European nations have a multitude of political parties, meaning coalition governments are the norm.

Other countries, like the U.K., have party rules that make it relatively easy to replace leaders. Under such conditions, outcomes in political leadership races are less predictable, and there's more turnover. Britain has had , while .

Women are largely absent among world leaders. The few women who have recently reached the pinnacle of political power have done so early in their careers. while . .

Working longer

Around the world people are living longer and healthier lives than ever before in human history, . This is good news, but there are concerns about elderly and long-serving leaders.

They may be out of touch with the younger generations they need to represent. Solutions to policy conundrums that worked for them decades ago might no longer apply now or in the future.

Their attitudes and perspectives may become conservative or inflexible. , they probably don't have children in kindergarten and so don't see how policy plays out in real life.

Transitions from one leader to another are among in the political life of a nation, whether they're democracies or authoritarian regimes. The Capitol Hill riots in the United States during the are a reminder of how even in the "world's greatest democracy," long-established rules about the transfer of power can quickly be undermined.

But when the same person dominates public life in a nation for a long time, transitions are bound to be even more difficult. This is especially worrying in a large and powerful country since internal volatility can quickly have dramatic, and unpredictable, international repercussions.

Long-term rulers rarely prepare a succession plan, if only because doing so jeopardizes their grip on power.

But without a succession strategy and strong institutions that support a peaceful transition to the next leader, the aging leaders of the world's superpowers can represent a serious threat to the global order.

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