diff --git includes/bootstrap.inc includes/bootstrap.inc
index 1a53a89..bfd2277 100644
--- includes/bootstrap.inc
+++ includes/bootstrap.inc
@@ -1096,7 +1096,7 @@ function drupal_serve_page_from_cache(stdClass $cache) {
   // do not bother caching the page in a public proxy, because the cached copy
   // will only be served to that particular user due to Vary: Cookie, unless
   // the Vary header has been replaced or unset in hook_boot() (see below).
-  $max_age = !variable_get('page_cache_invoke_hooks', TRUE) && (!isset($_COOKIE[session_name()]) || isset($hook_boot_headers['vary'])) ? variable_get('cache_lifetime', 0) : 0;
+  $max_age = !variable_get('page_cache_invoke_hooks', TRUE) && (!isset($_COOKIE[session_name()]) || isset($hook_boot_headers['vary'])) ? variable_get('page_cache_maximum_age', 0) : 0;
   $default_headers['Cache-Control'] = 'public, max-age=' . $max_age;
 
   // Entity tag should change if the output changes.
diff --git modules/system/system.admin.inc modules/system/system.admin.inc
index c462fb6..395514e 100644
--- modules/system/system.admin.inc
+++ modules/system/system.admin.inc
@@ -1624,10 +1624,10 @@ function system_performance_settings() {
 
   $cache = variable_get('cache', CACHE_DISABLED);
   $form['caching']['cache'] = array(
-    '#type' => 'radios',
-    '#title' => t('Page cache for anonymous users'),
+    '#type' => 'checkbox',
+    '#title' => t('Cache pages for anonymous users'),
     '#default_value' => $cache,
-    '#options' => array(CACHE_DISABLED => t('Disabled'), CACHE_NORMAL => t('Normal (recommended)')),
+    '#weight' => -2,
   );
   $period = drupal_map_assoc(array(0, 60, 180, 300, 600, 900, 1800, 2700, 3600, 10800, 21600, 32400, 43200, 86400), 'format_interval');
   $period[0] = '<' . t('none') . '>';
@@ -1636,7 +1636,14 @@ function system_performance_settings() {
     '#title' => t('Minimum cache lifetime'),
     '#default_value' => variable_get('cache_lifetime', 0),
     '#options' => $period,
-    '#description' => t('The minimum amount of time that will elapse before the caches are recreated.')
+    '#description' => t('Cached pages will not be re-created until at least this much time has elapsed.')
+  );
+  $form['caching']['page_cache_maximum_age'] = array(
+    '#type' => 'select',
+    '#title' => t('Expiration of cached pages'),
+    '#default_value' => variable_get('page_cache_maximum_age', 0),
+    '#options' => $period,
+    '#description' => t('The maximum age value that is sent in page headers to external caches.')
   );
 
   $directory = 'public://';