That Tun Dr Mahathir Mohamad was criss-crossing Malaysia to campaign and speak at rallies at the age of 92 had already made many people wonder how he remains so healthy and energetic.
When he led the Pakatan Harapan coalition to an upset victory in Malaysia's May 9 general election to become the world's oldest elected prime minister, a lot more people asked the same question.
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A version of this article appeared in the print edition of The Sunday Times on May 27, 2018, with the headline The art of ageing well: Seniors who look vibrant and feel young. Subscribe