Speaking of Telephone Numbers … and Brain Ageing – Emil Toescu & Alex Verkhratsky (p.14)

The accumulated evidence indicates that the main cause of age-dependent changes in neuronal function is…. Wait! We’d better stop before falling into this trap. The scientific study of ageing is peppered with evidence that shows that almost anything that can go wrong, does go wrong with age, and many hypotheses invoking this or suggesting single process as the ultimate cause have been proposed.