diff --git a/oauth2_provider/admin.py b/oauth2_provider/admin.py
index dd636184c..99c6115f1 100644
--- a/oauth2_provider/admin.py
+++ b/oauth2_provider/admin.py
@@ -19,7 +19,15 @@
 
 
 class ApplicationAdmin(admin.ModelAdmin):
-    list_display = ("pk", "name", "user", "client_type", "authorization_grant_type")
+    list_display = (
+        "pk", 
+        "name",
+        "user",
+        "access_token_expire_seconds",
+        "refresh_token_expire_seconds",
+        "client_type",
+        "authorization_grant_type",
+    )
     list_filter = ("client_type", "authorization_grant_type", "skip_authorization")
     radio_fields = {
         "client_type": admin.HORIZONTAL,
diff --git a/oauth2_provider/migrations/0001_initial.py b/oauth2_provider/migrations/0001_initial.py
index 1d1a38e0e..5663eb76d 100644
--- a/oauth2_provider/migrations/0001_initial.py
+++ b/oauth2_provider/migrations/0001_initial.py
@@ -36,6 +36,8 @@ class Migration(migrations.Migration):
                 ('skip_authorization', models.BooleanField(default=False)),
                 ('created', models.DateTimeField(auto_now_add=True)),
                 ('updated', models.DateTimeField(auto_now=True)),
+                ('access_token_expire_seconds', models.IntegerField(default=oauth2_settings.ACCESS_TOKEN_EXPIRE_SECONDS)),
+                ('refresh_token_expire_seconds', models.IntegerField(default=oauth2_settings.REFRESH_TOKEN_EXPIRE_SECONDS)),
             ],
             options={
                 'abstract': False,
diff --git a/oauth2_provider/models.py b/oauth2_provider/models.py
index a76db37c0..8efc696da 100644
--- a/oauth2_provider/models.py
+++ b/oauth2_provider/models.py
@@ -148,6 +148,12 @@ class AbstractApplication(models.Model):
         default="",
     )
 
+    access_token_expire_seconds = models.IntegerField(
+        default=oauth2_settings.ACCESS_TOKEN_EXPIRE_SECONDS
+    )
+    refresh_token_expire_seconds = models.IntegerField(
+        default=oauth2_settings.REFRESH_TOKEN_EXPIRE_SECONDS
+    )
     class Meta:
         abstract = True
 
@@ -516,6 +522,29 @@ class AbstractRefreshToken(models.Model):
     updated = models.DateTimeField(auto_now=True)
     revoked = models.DateTimeField(null=True)
 
+    @property
+    def is_expired(self):
+        """Determine if RefreshToken is expired."""
+        expire_seconds = self.application.refresh_token_expire_seconds
+        expires = self.created + timedelta(seconds=expire_seconds)
+
+        now = timezone.now()
+        is_refresh_token_expired = now >= expires
+        
+        # Access token assumed to be expired, by default.
+        is_access_token_expired = True
+        
+        # RefreshToken should not outlive AccessToken.
+        # NOTE: Check AccessToken expiration for backwards compatibility with
+        # long-lived tokens.
+        if self.access_token:
+            access_token_expires = self.access_token.expires
+            is_access_token_expired = now >= access_token_expires
+
+        # RefreshToken expired if and only if both refresh and access tokens
+        # are expired.
+        return is_refresh_token_expired and is_access_token_expired
+
     def revoke(self):
         """
         Mark this refresh token revoked and revoke related access token
diff --git a/oauth2_provider/oauth2_validators.py b/oauth2_provider/oauth2_validators.py
index db459a446..0343f677a 100644
--- a/oauth2_provider/oauth2_validators.py
+++ b/oauth2_provider/oauth2_validators.py
@@ -589,14 +589,22 @@ def _save_bearer_token(self, token, request, *args, **kwargs):
         if "scope" not in token:
             raise FatalClientError("Failed to renew access token: missing scope")
 
+        # "authenticate_client" sets the client (Application) on request.
+        app = request.client
+
+        # Users on older app versions should get long-lived tokens for
+        # backwards compatibility.
+        TRUE_VALUES = [True, 'True', 'true']
+        is_legacy_token = getattr(request, 'is_legacy_token', False)
+
+        if is_legacy_token in TRUE_VALUES:
+            expire_seconds = oauth2_settings.LEGACY_ACCESS_TOKEN_EXPIRE_SECONDS
+        else:
+            expire_seconds = app.access_token_expire_seconds
+
         # expires_in is passed to Server on initialization
         # custom server class can have logic to override this
-        expires = timezone.now() + timedelta(
-            seconds=token.get(
-                "expires_in",
-                oauth2_settings.ACCESS_TOKEN_EXPIRE_SECONDS,
-            )
-        )
+        expires = timezone.now() + timedelta(seconds=expire_seconds)
 
         if request.grant_type == "client_credentials":
             request.user = None
@@ -760,7 +768,10 @@ def validate_user(self, username, password, client, request, *args, **kwargs):
         getattr(http_request, request.http_method).update(dict(request.decoded_body))
         http_request.META = request.headers
         u = authenticate(http_request, username=username, password=password)
-        if u is not None and u.is_active:
+
+         # NOTE: [11/20/2020] Removed check for u.is_active because the check
+        # will be made *before* calling DOT (Django OAuth Toolkit)
+        if u is not None:
             request.user = u
             return True
         return False
@@ -782,11 +793,25 @@ def validate_refresh_token(self, refresh_token, client, request, *args, **kwargs
         Also attach User instance to the request object
         """
 
-        rt = RefreshToken.objects.filter(token=refresh_token).select_related("access_token").first()
+
+        rt = (
+            RefreshToken.objects
+            .filter(token=refresh_token)
+            .select_related("user", "access_token", "application")
+            .first()
+        )
 
         if not rt:
             return False
 
+        # Revoke token if expired.
+        if rt.is_expired:
+            try:
+                rt.revoke()
+            # Catch exception in case access or refresh token do not exist
+            except (AccessToken.DoesNotExist, RefreshToken.DoesNotExist):
+                pass
+
         if rt.revoked is not None and rt.revoked <= timezone.now() - timedelta(
             seconds=oauth2_settings.REFRESH_TOKEN_GRACE_PERIOD_SECONDS
         ):
@@ -801,7 +826,13 @@ def validate_refresh_token(self, refresh_token, client, request, *args, **kwargs
         # Temporary store RefreshToken instance to be reused by get_original_scopes and save_bearer_token.
         request.refresh_token_instance = rt
 
-        return rt.application == client
+        # Token is valid if it refers to the right client AND is not expired
+        is_valid = (
+            rt.application == client and
+            not rt.is_expired
+        )
+
+        return is_valid
 
     def _save_id_token(self, jti, request, expires, *args, **kwargs):
         scopes = request.scope or " ".join(request.scopes)
diff --git a/oauth2_provider/settings.py b/oauth2_provider/settings.py
index 9771aa4e7..b1e1dbdf9 100644
--- a/oauth2_provider/settings.py
+++ b/oauth2_provider/settings.py
@@ -51,9 +51,13 @@
     "READ_SCOPE": "read",
     "WRITE_SCOPE": "write",
     "AUTHORIZATION_CODE_EXPIRE_SECONDS": 60,
-    "ACCESS_TOKEN_EXPIRE_SECONDS": 36000,
+    "ACCESS_TOKEN_EXPIRE_SECONDS": 86400,  # 24 hours in seconds.
     "ID_TOKEN_EXPIRE_SECONDS": 36000,
-    "REFRESH_TOKEN_EXPIRE_SECONDS": None,
+    "REFRESH_TOKEN_EXPIRE_SECONDS": 31556952,  # 1 year in seconds.
+
+    # Older app versions should get long-lived auth tokens.
+    "LEGACY_ACCESS_TOKEN_EXPIRE_SECONDS": 315569520,  # 10 years
+
     "REFRESH_TOKEN_GRACE_PERIOD_SECONDS": 0,
     "REFRESH_TOKEN_REUSE_PROTECTION": False,
     "ROTATE_REFRESH_TOKEN": True,