Tales of the Fountain of Youth have been told for thousands of years across countless civilisations. The ability to turn back the ageing clock is the stuff of legend and one of humanity’s greatest desires.  Scientists across the world have been trying to reverse ageing for decades, and now Australian researcher David Sinclair has come closer than ever before.  But if we could stop the ageing process, would we really want to? Today, Lifestyle Health Editor Sarah Berry on the latest frontier in the fight against old age.Subscribe to The Age & SMH: https://subscribe.smh.com.au/See omnystudio.com/listener for privacy information.