diff --git a/gui/default/assets/lang/lang-en.json b/gui/default/assets/lang/lang-en.json
index bd448ab47..ee135ce8c 100644
--- a/gui/default/assets/lang/lang-en.json
+++ b/gui/default/assets/lang/lang-en.json
@@ -101,6 +101,7 @@
    "Disables comparing and syncing file permissions. Useful on systems with nonexistent or custom permissions (e.g. FAT, exFAT, Synology, Android).": "Disables comparing and syncing file permissions. Useful on systems with nonexistent or custom permissions (e.g. FAT, exFAT, Synology, Android).",
    "Discard": "Discard",
    "Disconnected": "Disconnected",
+   "Disconnected (Inactive)": "Disconnected (Inactive)",
    "Disconnected (Unused)": "Disconnected (Unused)",
    "Discovered": "Discovered",
    "Discovery": "Discovery",
@@ -228,6 +229,9 @@
    "Minimum Free Disk Space": "Minimum Free Disk Space",
    "Mod. Device": "Mod. Device",
    "Mod. Time": "Mod. Time",
+   "More than a month ago": "More than a month ago",
+   "More than a week ago": "More than a week ago",
+   "More than a year ago": "More than a year ago",
    "Move to top of queue": "Move to top of queue",
    "Multi level wildcard (matches multiple directory levels)": "Multi level wildcard (matches multiple directory levels)",
    "Never": "Never",
diff --git a/gui/default/index.html b/gui/default/index.html
index 59d348768..62f3eaef1 100644
--- a/gui/default/index.html
+++ b/gui/default/index.html
@@ -748,6 +748,7 @@
                       <span ng-switch-when="paused"><span class="hidden-xs" translate>Paused</span><span class="visible-xs" aria-label="{{'Paused' | translate}}"><i class="fas fa-fw fa-pause"></i></span></span>
                       <span ng-switch-when="unused-paused"><span class="hidden-xs" translate>Paused (Unused)</span><span class="visible-xs" aria-label="{{'Paused (Unused)' | translate}}"><i class="fas fa-fw fa-unlink"></i></span></span>
                       <span ng-switch-when="disconnected"><span class="hidden-xs" translate>Disconnected</span><span class="visible-xs" aria-label="{{'Disconnected' | translate}}"><i class="fas fa-fw fa-power-off"></i></span></span>
+                      <span ng-switch-when="disconnected-inactive"><span class="hidden-xs" translate>Disconnected (Inactive)</span><span class="visible-xs" aria-label="{{'Disconnected (Inactive)' | translate}}"><i class="fas fa-fw fa-power-off"></i></span></span>
                       <span ng-switch-when="unused-disconnected"><span class="hidden-xs" translate>Disconnected (Unused)</span><span class="visible-xs" aria-label="{{'Disconnected (Unused)' | translate}}"><i class="fas fa-fw fa-unlink"></i></span></span>
                     </span>
                     <span ng-switch="rdConnType(deviceCfg.deviceID)" class="remote-devices-panel">
@@ -767,8 +768,21 @@
                     <tbody>
                       <tr ng-if="!connections[deviceCfg.deviceID].connected">
                         <th><span class="fas fa-fw fa-eye"></span>&nbsp;<span translate>Last seen</span></th>
-                        <td translate ng-if="!deviceStats[deviceCfg.deviceID].lastSeenDays || deviceStats[deviceCfg.deviceID].lastSeenDays >= 365" class="text-right">Never</td>
-                        <td ng-if="deviceStats[deviceCfg.deviceID].lastSeenDays < 365" class="text-right">{{deviceStats[deviceCfg.deviceID].lastSeen | date:"yyyy-MM-dd HH:mm:ss"}}</td>
+                        <td class="text-right">
+                          <div ng-if="!deviceStats[deviceCfg.deviceID].lastSeenDays" translate>
+                            Never
+                          </div>
+                          <div ng-if="deviceStats[deviceCfg.deviceID].lastSeenDays">
+                            <div>
+                              {{deviceStats[deviceCfg.deviceID].lastSeen | date:"yyyy-MM-dd HH:mm:ss"}}
+                            </div>
+                            <div ng-if="deviceStats[deviceCfg.deviceID].lastSeenDays >= 7">
+                              <i ng-if="deviceStats[deviceCfg.deviceID].lastSeenDays < 30" translate>More than a week ago</i>
+                              <i class="text-warning" ng-if="deviceStats[deviceCfg.deviceID].lastSeenDays >= 30 && deviceStats[deviceCfg.deviceID].lastSeenDays < 365" translate>More than a month ago</i>
+                              <i class="text-danger" ng-if="deviceStats[deviceCfg.deviceID].lastSeenDays >= 365" translate>More than a year ago</i>
+                            </div>
+                          </div>
+                        </td>
                       </tr>
                       <tr ng-if="!connections[deviceCfg.deviceID].connected && deviceFolders(deviceCfg).length > 0">
                         <th><span class="fas fa-fw fa-cloud"></span>&nbsp;<span translate>Sync Status</span></th>
diff --git a/gui/default/syncthing/core/syncthingController.js b/gui/default/syncthing/core/syncthingController.js
index 4fe78e7ff..ed480a725 100755
--- a/gui/default/syncthing/core/syncthingController.js
+++ b/gui/default/syncthing/core/syncthingController.js
@@ -865,7 +865,9 @@ angular.module('syncthing.core')
                 $scope.deviceStats = data;
                 for (var device in $scope.deviceStats) {
                     $scope.deviceStats[device].lastSeen = new Date($scope.deviceStats[device].lastSeen);
-                    $scope.deviceStats[device].lastSeenDays = (new Date() - $scope.deviceStats[device].lastSeen) / 1000 / 86400;
+                    if ($scope.deviceStats[device].lastSeen.toISOString() !== '1970-01-01T00:00:00.000Z') {
+                        $scope.deviceStats[device].lastSeenDays = (new Date() - $scope.deviceStats[device].lastSeen) / 1000 / 86400;
+                    }
                 }
                 console.log("refreshDeviceStats", data);
             }).error($scope.emitHTTPError);
@@ -1073,8 +1075,9 @@ angular.module('syncthing.core')
 
         $scope.deviceStatus = function (deviceCfg) {
             var status = '';
+            var unused = $scope.deviceFolders(deviceCfg).length === 0;
 
-            if ($scope.deviceFolders(deviceCfg).length === 0) {
+            if (unused) {
                 status = 'unused-';
             }
 
@@ -1095,7 +1098,11 @@ angular.module('syncthing.core')
             }
 
             // Disconnected
-            return status + 'disconnected';
+            if (!unused && $scope.deviceStats[deviceCfg.deviceID].lastSeenDays >= 7) {
+                return status + 'disconnected-inactive';
+            } else {
+                return status + 'disconnected';
+            }
         };
 
         $scope.deviceClass = function (deviceCfg) {