Use timespan for year-only data

app/User.php

@@ -235,18 +235,19 @@ class User extends Authenticatable
     public function getAgeAttribute()
     {
         $age = null;
+        $yearOnlySuffix = Carbon::now()->format('-m-d');
 
         if ($this->dob && !$this->dod) {
             $age = Carbon::parse($this->dob)->timespan();
         }
         if (!$this->dob && $this->yob) {
-            $age = (date('Y') - $this->yob).' tahun';
+            $age = Carbon::parse($this->yob.$yearOnlySuffix)->timespan();
         }
         if ($this->dob && $this->dod) {
             $age = Carbon::parse($this->dob)->timespan($this->dod);
         }
         if (!$this->dob && $this->yob && !$this->dod && $this->yod) {
-            $age = ($this->yod - $this->yob).' tahun';
+            $age = Carbon::parse($this->yob.$yearOnlySuffix)->timespan($this->yod.$yearOnlySuffix);
         }
         if ($this->dob && $this->yob && $this->dod && $this->yod) {
             $age = Carbon::parse($this->dob)->timespan($this->dod);

tests/Unit/UserTest.php

@@ -174,7 +174,7 @@ class UserTest extends TestCase
         return [
             ['2018-02-02', '1997-01-01', '1997', null, null, '21 tahun, 1 bulan, 1 hari'],
             ['2018-02-02', '1997-01-01', null, null, null, '21 tahun, 1 bulan, 1 hari'],
-            ['2018-02-02', null, '1997', null, null, '22 tahun'],
+            ['2018-02-02', null, '1997', null, null, '21 tahun'],
             ['2018-02-02', '1997-01-01', '1997', '2017-01-01', '2017', '20 tahun'],
             ['2018-02-02', null, '1997', null, '2017', '20 tahun'],
         ];