17-year-old Kenyan athletics champion is forced to release his passport and birth certificate following doubts over his age (Photos)

One man wrote on social media: 'I think this could be a case like that of Benjamin Button.'

Another account said: 'He looks like my dad.'

And one added: 'His eldest grandson is 17 years old.'

But in the documents, it was revealed that Zakayo was born in Narok, Kenya, on November 25, 2001, making him 17. The birth certificate was issued on March 17, 2016, when Zakayo was just 14.

According to Daily Mail, Zakayo is registered with the International Association of Athletics Federations (IAAF) with the same date of birth which appears in his passport and birth certificate.