The oldest world leaders tend to govern the youngest countries: Cameroon's Paul Biya is 93, which puts him 75.2 years above his country's median age of 17.8.

Who is the oldest president in the world?

Paul Biya of Cameroon is the oldest president in the world at 93, and the widest gap between a leader's age and their country's median age belongs to him: 75.2 years above Cameroon's median of 17.8. Pew Research Center confirms Biya is the oldest national leader in its analysis of 186 UN member states, and notes he has held the presidency for nearly 44 years, longer than 13 current national leaders have been alive.³

Malawi's Peter Mutharika, at 86, and Zimbabwe's Emmerson Mnangagwa, at 84, come next on the oldest world leaders list, both more than 66 years above their countries' median ages of 17.6 and 17.8 respectively. Seven of the world's ten oldest leaders are in countries that Freedom House categorises as 'not free'.³ Pew's median age for all national leaders is 63, and about two-thirds are in their 40s, 50s or 60s.³

Why do the youngest countries tend to have the oldest leaders?

Several of Africa's longest-serving leaders came to power through coups or political transitions decades ago and have remained in office ever since, meaning the youngest countries often ended up with leaders who are now very old. According to Pulse Ghana, five sitting African presidents had each been in power for more than three decades as of 2025: Teodoro Obiang Nguema Mbasogo of Equatorial Guinea, Paul Biya, Denis Sassou Nguesso, Yoweri Museveni and Isaias Afwerki.⁶ The Independent notes that it may be that older leaders are there because they got power young, and that this is often true of Africa.¹

Structural factors help keep these leaders in place. Over 60 per cent of Cameroon's 30 million people are 25 or under, yet most Cameroonians have never known a president other than Biya.⁵ The gap between an overwhelmingly youthful population and a leader several generations removed is described by CIVICUS Lens as 'increasingly untenable'.⁵

Is Donald Trump the oldest president?

Donald Trump, at 80, is not the oldest president in the world: Pew Research Center found that just 16 of 186 national leaders are older than Trump, with Biya at 93 and Saudi Arabia's King Salman at 90 heading the list.³ Trump is 42.0 years above the United States median age of 38.0. By comparison, Biya's gap of 75.2 years is nearly double that.

Trump is, however, the oldest elected US president. The Independent reports that medical experts' concerns about Trump run deeper than visible physical symptoms such as bruising and swollen ankles, with Dr. Henry Abraham, a Nobel Prize-winning professor of Psychiatry Emeritus at Tufts University School of Medicine, citing 'poor impulse control, poor control over his rage, sleeplessness at night, unrelenting aggression toward his perceived enemies' as warning flags.⁴ The White House dismissed such concerns, with spokesman Davis Ingle calling them the work of 'Democrat hack doctors'.⁴

What do political scientists say about aging leaders and governance?

Political scientist Charles McClean found in 2025 that older lawmakers spend significantly less on child and youth welfare, whereas younger lawmakers maintain spending for elderly populations without cutting services, according to a Deseret News opinion piece citing his research.² Researchers led by Kevin Dano found that leadership turnover directly leads to improvements in governance, economic performance and national health.²

The Independent describes a world 'dominated by anti-democratic gerontocrats, in which ageing leaders are stifling freedom', and cites Pew data showing that the median age of leaders of not-free countries is higher than that of free countries.¹ In the United States, the average lawmaker is more than 20 years older than the median citizen, making America the least age-representative government among the world's major democratic economies, according to The Economist as cited by Deseret News.² A 2023 Pew survey found that 79 per cent of Americans support age limits for elected officials in Washington.³

Who gains and who loses when elderly leaders govern young populations?

For young populations governed by elderly leaders, the picture is largely one of unmet needs. Post-election protests were met with lethal security force violence, and more protests are described as 'inevitable' as the generational gap widens.⁵

On the question of who gains, The Independent notes that leaders who have been in power for many years have 'clung to it, or deepened it', and that some, like Trump, have 'perceived the delights of executive fiat and tried to smash constitutional guardrails'.¹ Political scientist McClean's research suggests that younger populations bear a policy cost: older lawmakers direct less spending toward child and youth welfare.² A constitutional age cap, Deseret News argues, would trigger retirement for around 30 per cent of the US House and 50 per cent of the Senate, based on legislative demographics compiled by data researcher Elena Ramirez.²