Tech entrepreneur Bryan Johnson, 45, spends millions of dollars a year trying to reduce his biological age.

The BBC’s Lara Lewington travels to California to meet Mr Johnson – and the scientists researching whether the ageing process can be stopped, or even reversed.

This documentary is from Click – the BBC’s flagship technology programme.

Please subscribe here: http://bit.ly/1rbfUog

#Ageing #Science #BBCNews