diff --git a/README.md b/README.md
index 82b603a..0045c16 100644
--- a/README.md
+++ b/README.md
@@ -13,6 +13,7 @@ Not all issues are taken into account:
 
 - Issues from collaborators are ignored
 - Issues with labels like "feature", "enhancement", "duplicate"… are ignored
+- For the issue median closing time, issues closed and older than 6 months are ignored
 
 Ideas:
 
diff --git a/src/Maintained/Application/View/home.twig b/src/Maintained/Application/View/home.twig
index c993d5d..6f5f044 100644
--- a/src/Maintained/Application/View/home.twig
+++ b/src/Maintained/Application/View/home.twig
@@ -88,7 +88,8 @@
                     <p class="small">
                         Issues or pull requests opened by the collaborators are ignored.
                         Some issues are also ignored based on their labels (example of ignored
-                        labels: "enhancement", "feature"…).
+                        labels: "enhancement", "feature"…). For the median time needed to close an
+                        issue, issues closed and older than 6 months are ignored too.
                     </p>
                 </div>
             </div>
diff --git a/src/Maintained/Application/View/project.twig b/src/Maintained/Application/View/project.twig
index d22de97..6a4a93c 100644
--- a/src/Maintained/Application/View/project.twig
+++ b/src/Maintained/Application/View/project.twig
@@ -36,6 +36,7 @@
                             Issues or pull requests opened by the collaborators are ignored.
                             Some issues are also ignored based on their labels (example of ignored
                             labels: "enhancement", "feature"…).
+                            Issues closed and older than 6 months are ignored.
                         </p>
                         <p class="input-group input-group-sm">
                             <span class="input-group-addon">Image:</span>
diff --git a/src/Maintained/Issue.php b/src/Maintained/Issue.php
index 6f3a481..109c0b4 100644
--- a/src/Maintained/Issue.php
+++ b/src/Maintained/Issue.php
@@ -28,6 +28,13 @@ class Issue
      */
     private $open;
 
+    /**
+     * Date the issue has been opened.
+     *
+     * @var DateTime
+     */
+    private $openedAt;
+
     /**
      * Duration the issue has been opened for.
      *
@@ -56,14 +63,14 @@ class Issue
         $issue->author = $data['user']['login'];
         $issue->open = ($data['state'] === self::STATE_OPEN);
 
-        $openingDate = new DateTime($data['created_at']);
+        $issue->openedAt = new DateTime($data['created_at']);
         if (! $issue->open) {
             $endDate = new DateTime($data['closed_at']);
         } else {
             $endDate = new DateTime();
         }
 
-        $issue->openedFor = TimeInterval::from($endDate, $openingDate);
+        $issue->openedFor = TimeInterval::from($endDate, $issue->openedAt);
 
         $labels = [];
         foreach ($data['labels'] as $dataLabel) {
@@ -82,6 +89,14 @@ class Issue
         return $this->author;
     }
 
+    /**
+     * @return DateTime
+     */
+    public function getOpenedAt()
+    {
+        return $this->openedAt;
+    }
+
     /**
      * @return TimeInterval
      */
diff --git a/src/Maintained/Statistics/StatisticsComputer.php b/src/Maintained/Statistics/StatisticsComputer.php
index 80c1d1c..77ce9a8 100644
--- a/src/Maintained/Statistics/StatisticsComputer.php
+++ b/src/Maintained/Statistics/StatisticsComputer.php
@@ -38,8 +38,10 @@ class StatisticsComputer implements StatisticsProvider
         $issues = $this->excludeIssuesCreatedByCollaborators($issues, $collaborators);
         $issues = $this->excludeIssuesByLabels($issues, $this->excludedLabels);
 
+        $latestIssues = $this->keepLatestIssues($issues);
+
         $statistics = new Statistics();
-        $statistics->resolutionTime = $this->computeResolutionTime($issues);
+        $statistics->resolutionTime = $this->computeResolutionTime($latestIssues);
         $statistics->openIssuesRatio = $this->computeOpenIssueRatio($issues);
 
         return $statistics;
@@ -114,6 +116,22 @@ class StatisticsComputer implements StatisticsProvider
         });
     }
 
+    /**
+     * @param Issue[]  $issues
+     * @return Issue[]
+     */
+    private function keepLatestIssues(array $issues)
+    {
+        $sixMonthsAgo = new \DateTime('-6 month');
+
+        return array_filter($issues, function (Issue $issue) use ($sixMonthsAgo) {
+            if ($issue->isOpen()) {
+                return true;
+            }
+            return $issue->getOpenedAt() > $sixMonthsAgo;
+        });
+    }
+
     /**
      * @param float[] $array
      * @return float