diff --git a/src/flag-definitions.h b/src/flag-definitions.h
index b25fe5f19d..61cd864036 100644
--- a/src/flag-definitions.h
+++ b/src/flag-definitions.h
@@ -404,7 +404,7 @@ DEFINE_bool(flush_code, true,
             "flush code that we expect not to use again (during full gc)")
 DEFINE_bool(flush_code_incrementally, false,
             "flush code that we expect not to use again (incrementally)")
-DEFINE_bool(age_code, false,
+DEFINE_bool(age_code, true,
             "track un-executed functions to age code and flush only "
             "old code")
 DEFINE_bool(incremental_marking, true, "use incremental marking")