Pioneer of cell aging research and discoverer of the Hayflick limit. All human somatic cells come to the end of their finite lifespans. Sadly, the same can now be said for the scientist who first discovered this phenomenon. On 1 August 2024, Leonard Hayflick, a pioneer in cell aging research and discoverer of the ‘Hayflick limit’, met the end of his own spectacular life at his home in The Sea Ranch, California.