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.
Jawapannya: molekul hayat panjang, sebab jika molekul hayat pendek mengalami kerosakan, molekul tersebut juga termusnah -- seperti protein dimusnahkan oleh proteolisis – maka kerosakan tersebut turut hilang.