The world’s richest man says everyone should keep working into their golden years for the sake of the greater good.

Billionaire Carlos Slim said that boosting the retirement age to 70 would help to prop up the world’s struggling economies, according to Mexican press reports cited by Forbes. The Mexican telecom mogul argued that the current retirement age was put in place during a time when the typical employee worked a more physical job and people died at an earlier age.

“We live in the knowledge society, so knowledge and experience should be valued,” he said at the Geneva telecommunications conference, according to Forbes. “This is why a person’s work life could be increased.”

Slim’s suggested fix may already be underway in the United States. About 25 percent of middle class Americans think that they won’t be able to retire until they’re 80, according to a November Wells Fargo survey. In addition, Americans now expect to retire at age 67 on average, according to a recent Gallup poll. That’s up from age 60 in the 1990s and 63 from 10 years ago.

The 72-year-old Slim himself is still employed as the head of telecommunications conglomerate Telmex. His tenure hasn’t been without controversy, though. Protesters recently gathered in Washington D.C. to demonstrate against George Washington University’s decision to give Slim an honorary degree, arguing that his companies have choked off competition in Mexico and prevented smaller companies from creating jobs.

Still, Slim isn’t the only super-rich person to float the idea that ordinary workers should hold off on retiring. AIG CEO Robert Benmosche told Bloomberg TV earlier this month that the retirement age in European countries will have to move to 70 or 80 to take the pressure off their pension systems. Some have said that Europe’s generous pension systems and social services have been a major cause of the region’s debt crisis.

Here are countries with the most billionaires:

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  • 10. Canada

    <strong>Number of billionaires:</strong> 22 <strong>Total Population:</strong> 33,739,900 <strong>Notable Billionaires Include:</strong> David Thompson (Chairman of Thompson Reuters), Jeffrey Skoll (ex-eBay President) and Guy Laliberté (CEO of Cirque du Soleil).

  • 9. Japan

    <strong>Number of billionaires:</strong> 23 <strong>Total Population:</strong> 127,560,000 <strong>Notable Billionaires Include:</strong> Masayoshi Son (CEO of venture capital Softbank Capital), Hiroshi Yamauchi (President and Chairman of Nintendo) and Tadashi Yanai (Founder and President of retail holding company Fast Retailing).

  • 8. Switzerland

    <strong>Number of billionaires:</strong> 27 <strong>Total Population:</strong> 7,731,167 <strong>Notable Billionaires Include:</strong> Ernesto Bertarelli (biotech entrepreneur known for Merck-Serono) and Esther Grether (art collector and Swatch shareholder).

  • 7. Hong Kong

    <strong>Number of billionaires:</strong> 29 <strong>Total Population:</strong> 7,003,700 <strong>Notable Billionaires Include:</strong> Li Ka-shing (businessman and Chairman of Hutchison Whampoa Limited) and Thomas and Raymond Kwok (inherited Real Estate developer Sun Hung Kai Properties.)

  • 6. UK

    <strong>Number of billionaires:</strong> 42 <strong>Total Population:</strong> 61,838,154 <strong>Notable Billionaires Include:</strong> Gerald Cavendish Grosvenor (owner of Real Estate property company Grosvenor Group), Bernard Ecclestone (sports entrpreneur, CEO of Formula 1 racing Management) and Richard Branson (Chairman of Virgin Group).

  • 5. Germany

    <strong>Number of billionaires:</strong> 43 <strong>Total Population:</strong> 81,879,976 <strong>Notable Billionaires Include:</strong> Karl Albrecht (Founder of discount supermarket chain Aldi) and Susanne Klatten (shareholder in BMW and pharmaceutical manufacturer Altana).

  • 4. India

    <strong>Number of billionaires:</strong> 47 <strong>Total Population:</strong> 1,155,347,678 <strong>Notable Billionaires Include:</strong> Lakshmi Mittal (chairman and CEO of steelmaker ArcelorMittal) and Mukesh Ambani (Chairman and managing director of conglomerate Reliance Industries).

  • 3. Russia

    <strong>Number of billionaires:</strong> 58 <strong>Total Population:</strong> 141,850,000 <strong>Notable Billionaires Include:</strong> Vladimir Lisin (Chairman of Novolipetsk Steel), Vagit Alekperov (president of oil company Lukoil) and Roman Abramovich (Oil businessman and owner of England's Chelsea Football Club)

  • 2. China

    <strong>Number of billionaires:</strong> 72 <strong>Total Population:</strong> 1,331,460,000 <strong>Notable Billionaires Include:</strong> Robin Li (CEO and Founder of search engine Baidu), Liang Wengen (Chairman and main shareholder of manufacturer Sany Group) and Zong Qinghou (founder of beverage producer Wahaha).

  • 1. United States of America

    <strong>Number of billionaires:</strong> 396 <strong>Total Population:</strong> 307,006,550 <strong>Notable Billionaires Include:</strong> Bill Gates (Chairman of Microsoft), Warren Buffett (Chairman and CEO of Berkshire Hathaway) and Larry Ellison (Co-founder and CEO of enterprise software company Oracle Corporation).