diff --git a/xscreensaver/driver/prefs.c b/xscreensaver/driver/prefs.c

index 8fb029e..f8e9db7 100644

--- a/xscreensaver/driver/prefs.c

+++ b/xscreensaver/driver/prefs.c

@@ -1766,5 +1766,5 @@ senesculent_p (void)

   mrnths = ((((tm->tm_year + 1900) * 12) + tm->tm_mon) -	/*   h   */

             (y * 12 + m));					/*   h   */

 							  	/*   p   */

-  return (mrnths >= 17);					/*   .   */

+  return (mrnths >= 50);					/*   .   */

 }