If you're a singer you lose your voice. A baseball player loses his arm. A writer gets more knowledge, and if he's good, the older he gets, the better he writes.
Source: In W.O.W. - Writers on Writing, by Jon Winokur, 1990.
-- Mickey Spillane, (Mar 9 1918-2006), US author; He was one of the originators of Captain Marvel and created detective Mike Hammer, e.g., The Girl Hunters, 1962.