diff --git a/app/jobs/scheduled/summaries_backfill.rb b/app/jobs/scheduled/summaries_backfill.rb
index 2d9a3fdf..4b3205cb 100644
--- a/app/jobs/scheduled/summaries_backfill.rb
+++ b/app/jobs/scheduled/summaries_backfill.rb
@@ -12,22 +12,26 @@ module ::Jobs
 
       system_user = Discourse.system_user
 
+      if SiteSetting.ai_summary_gists_enabled
+        gist_t = AiSummary.summary_types[:gist]
+        backfill_candidates(gist_t)
+          .limit(current_budget(gist_t))
+          .each do |topic|
+            DiscourseAi::Summarization.topic_gist(topic).force_summarize(system_user)
+          end
+      end
+
       complete_t = AiSummary.summary_types[:complete]
       backfill_candidates(complete_t)
         .limit(current_budget(complete_t))
         .each do |topic|
           DiscourseAi::Summarization.topic_summary(topic).force_summarize(system_user)
         end
-
-      return unless SiteSetting.ai_summary_gists_enabled
-
-      gist_t = AiSummary.summary_types[:gist]
-      backfill_candidates(gist_t)
-        .limit(current_budget(gist_t))
-        .each { |topic| DiscourseAi::Summarization.topic_gist(topic).force_summarize(system_user) }
     end
 
     def backfill_candidates(summary_type)
+      max_age_days = SiteSetting.ai_summary_backfill_topic_max_age_days
+
       Topic
         .where("topics.word_count >= ?", SiteSetting.ai_summary_backfill_minimum_word_count)
         .joins(<<~SQL)
@@ -36,6 +40,7 @@ module ::Jobs
                           ais.target_type = 'Topic' AND
                           ais.summary_type = '#{summary_type}'
         SQL
+        .where("topics.created_at > current_timestamp - INTERVAL '#{max_age_days.to_i} DAY'")
         .where(
           "ais.id IS NULL OR UPPER(ais.content_range) < topics.highest_post_number + 1",
         ) # (1..1) gets stored ad (1..2).
diff --git a/config/settings.yml b/config/settings.yml
index 210dc6e1..443c8851 100644
--- a/config/settings.yml
+++ b/config/settings.yml
@@ -228,17 +228,17 @@ discourse_ai:
   ai_summary_gists_allowed_groups:
     type: group_list
     list_type: compact
-    default: ""
-  ai_summarization_strategy: # TODO(roman): Deprecated. Remove by Sept 2024
-    type: enum
-    default: ""
+    default: "0" #everyone
     hidden: true
-    choices: "DiscourseAi::Configuration::LlmEnumerator.old_summarization_options + ['']"
   ai_summarization_model_allowed_seeded_models:
     default: ""
     hidden: true
     type: list
     list_type: compact
+  ai_summary_backfill_topic_max_age_days:
+    default: 30
+    min: 1
+    max: 10000
   ai_summary_backfill_maximum_topics_per_hour:
     default: 0
     min: 0
diff --git a/spec/jobs/scheduled/summaries_backfill_spec.rb b/spec/jobs/scheduled/summaries_backfill_spec.rb
index ebf6831f..2a4ee49a 100644
--- a/spec/jobs/scheduled/summaries_backfill_spec.rb
+++ b/spec/jobs/scheduled/summaries_backfill_spec.rb
@@ -64,6 +64,13 @@ RSpec.describe Jobs::SummariesBackfill do
 
       expect(subject.backfill_candidates(type).map(&:id)).to contain_exactly(topic_2.id, topic.id)
     end
+
+    it "respects max age setting" do
+      SiteSetting.ai_summary_backfill_topic_max_age_days = 1
+      topic.update!(created_at: 2.days.ago)
+
+      expect(subject.backfill_candidates(type)).to be_empty
+    end
   end
 
   describe "#execute" do
@@ -80,7 +87,7 @@ RSpec.describe Jobs::SummariesBackfill do
       gist_2 = "Gist of topic"
 
       DiscourseAi::Completions::Llm.with_prepared_responses(
-        [summary_1, summary_2, gist_1, gist_2],
+        [gist_1, gist_2, summary_1, summary_2],
       ) { subject.execute({}) }
 
       expect(AiSummary.complete.find_by(target: topic_2).summarized_text).to eq(summary_1)
diff --git a/spec/lib/modules/summarization/entry_point_spec.rb b/spec/lib/modules/summarization/entry_point_spec.rb
index 035e57b3..723eed69 100644
--- a/spec/lib/modules/summarization/entry_point_spec.rb
+++ b/spec/lib/modules/summarization/entry_point_spec.rb
@@ -47,6 +47,7 @@ RSpec.describe DiscourseAi::Summarization::EntryPoint do
 
       describe "topic_list_item serializer's ai_summary" do
         context "when hot topic summarization is disabled" do
+          before { SiteSetting.ai_summary_gists_enabled = false }
           it "doesn't include summaries" do
             gist_topic = topic_query.list_hot.topics.find { |t| t.id == topic_ai_gist.target_id }