diff --git a/src/Functions/roundAge.cpp b/src/Functions/roundAge.cpp
index d2503bb6938..5c6f9b65279 100644
--- a/src/Functions/roundAge.cpp
+++ b/src/Functions/roundAge.cpp
@@ -15,8 +15,7 @@ struct RoundAgeImpl
 
     static inline ResultType apply(A x)
     {
-        return x < 1 ? 0
-            : (x < 18 ? 17
+        return (x < 18 ? 0
             : (x < 25 ? 18
             : (x < 35 ? 25
             : (x < 45 ? 35
diff --git a/tests/queries/0_stateless/00968_roundAge.sql b/tests/queries/0_stateless/00968_roundAge.sql
index c8e5a5579f2..f092dbf6560 100644
--- a/tests/queries/0_stateless/00968_roundAge.sql
+++ b/tests/queries/0_stateless/00968_roundAge.sql
@@ -1,7 +1,8 @@
 SELECT roundAge(0);
+SELECT roundAge(12);
 SELECT roundAge(18);
 SELECT roundAge(25);
 SELECT roundAge(35);
 SELECT roundAge(45);
 SELECT roundAge(55);
-SELECT roundAge(56);
\ No newline at end of file
+SELECT roundAge(56);