diff --git a/mongodbModels.go b/mongodbModels.go
index d6e6931..c51d165 100644
--- a/mongodbModels.go
+++ b/mongodbModels.go
@@ -1,9 +1,11 @@
 package main
 
 type UserModel struct {
-	ID      string `json:"id"`
-	Age     int    `json:",string"`
-	Actions []string
+	ID  string `json:"id"`
+	Age int    `json:",string"`
+	//age clusters: a<20 (0), 20<a<40 (1), 40<a<60 (2), 60<a (3)
+	AgeCluster int
+	Actions    []string
 }
 type ItemModel struct {
 	ID           string
diff --git a/serverRoutes.go b/serverRoutes.go
index 5d321a8..4dbbeff 100644
--- a/serverRoutes.go
+++ b/serverRoutes.go
@@ -51,11 +51,14 @@ func NewUser(w http.ResponseWriter, r *http.Request) {
 	err := decoder.Decode(&newUser)
 	check(err)
 	defer r.Body.Close()
+	newUser = user.clusterAge(newUser)
 
 	saveUser(userCollection, newUser)
 
 	fmt.Println(newUser)
-	fmt.Fprintln(w, "new user added: ", newUser.ID)
+	jNewUser, err := json.Marshal(newUser)
+	check(err)
+	fmt.Fprintln(w, string(jNewUser))
 }
 func Recommendations(w http.ResponseWriter, r *http.Request) {
 	ipFilter(w, r)
diff --git a/userOperations.go b/userOperations.go
new file mode 100644
index 0000000..bd91477
--- /dev/null
+++ b/userOperations.go
@@ -0,0 +1,20 @@
+package main
+
+var user UserModel
+
+func (userModel UserModel) clusterAge(u UserModel) UserModel {
+	if u.Age < 15 {
+		u.AgeCluster = 0
+	} else if 15 < u.Age && u.Age <= 25 {
+		u.AgeCluster = 1
+	} else if 25 < u.Age && u.Age <= 40 {
+		u.AgeCluster = 2
+	} else if 40 < u.Age && u.Age <= 50 {
+		u.AgeCluster = 3
+	} else if 50 < u.Age && u.Age <= 60 {
+		u.AgeCluster = 4
+	} else if 60 < u.Age {
+		u.AgeCluster = 5
+	}
+	return u
+}