" It's pretty difficult to actually reverse aging once it has started" As far as I know, there are two paradigms about ageing: There is a biological clock insi

" It's pretty difficult to actually reverse aging once it has started" As far as I know, there are two paradigms about ageing: There is a biological clock inside us or it's only entropy acting (damage accumulation). Both would start in the moment of conception. So, what it means "once it has started"?