The answer is: long-lived molecules, because if a short-lived molecule undergoes damage, but then the molecule is destroyed -- like by a protein being destroyed by proteolysis -- then the damage is gone, too.
Odgovor je, u dugovječnim molekulama, jer ako molekula kratkog vijeka doživi oštećenje, ona je uništena -- poput proteina kojeg uništava proteoliza -- a s njom nestaje i oštećenje.