diff --git a/app/models/form/lettings/questions/age1_known.rb b/app/models/form/lettings/questions/age1_known.rb
index aaf28e68a..42505b113 100644
--- a/app/models/form/lettings/questions/age1_known.rb
+++ b/app/models/form/lettings/questions/age1_known.rb
@@ -6,7 +6,6 @@ class Form::Lettings::Questions::Age1Known < ::Form::Question
     @header = "Do you know the lead tenant’s age?"
     @type = "radio"
     @check_answers_card_number = 1
-    @hint_text = "The ’lead’ or ’main’ tenant is the person in the household who does the most paid work. If several people do the same paid work, the lead tenant is whoever is the oldest."
     @answer_options = ANSWER_OPTIONS
     @conditional_for = { "age1" => [0] }
     @hidden_in_check_answers = { "depends_on" => [{ "age1_known" => 0 }, { "age1_known" => 1 }] }
@@ -14,4 +13,12 @@ class Form::Lettings::Questions::Age1Known < ::Form::Question
   end
 
   ANSWER_OPTIONS = { "0" => { "value" => "Yes" }, "1" => { "value" => "No" } }.freeze
+
+  def hint_text
+    if form.start_year_after_2024?
+      "The ’lead’ or ’main’ tenant is the person in the household who does the most paid work. If several people do the same amount of paid work, the lead tenant is whoever is the oldest."
+    else
+      "The ’lead’ or ’main’ tenant is the person in the household who does the most paid work. If several people do the same paid work, the lead tenant is whoever is the oldest."
+    end
+  end
 end
diff --git a/spec/models/form/lettings/questions/age1_known_spec.rb b/spec/models/form/lettings/questions/age1_known_spec.rb
new file mode 100644
index 000000000..680de4977
--- /dev/null
+++ b/spec/models/form/lettings/questions/age1_known_spec.rb
@@ -0,0 +1,88 @@
+require "rails_helper"
+
+RSpec.describe Form::Lettings::Questions::Age1Known, type: :model do
+  subject(:question) { described_class.new(nil, question_definition, page) }
+
+  let(:question_definition) { nil }
+  let(:page) { instance_double(Form::Page) }
+  let(:subsection) { instance_double(Form::Subsection) }
+  let(:form) { instance_double(Form) }
+
+  before do
+    allow(form).to receive(:start_year_after_2024?).and_return(false)
+    allow(page).to receive(:subsection).and_return(subsection)
+    allow(subsection).to receive(:form).and_return(form)
+  end
+
+  it "has correct page" do
+    expect(question.page).to eq(page)
+  end
+
+  it "has the correct type" do
+    expect(question.type).to eq("radio")
+  end
+
+  it "is not marked as derived" do
+    expect(question.derived?).to be false
+  end
+
+  it "has the correct answer_options" do
+    expect(question.answer_options).to eq({
+      "0" => { "value" => "Yes" },
+      "1" => { "value" => "No" },
+    })
+  end
+
+  it "has the correct check_answer_label" do
+    expect(question.check_answer_label).to eq("")
+  end
+
+  it "has the correct id" do
+    expect(question.id).to eq("age1_known")
+  end
+
+  it "has the correct header" do
+    expect(question.header).to eq("Do you know the lead tenant’s age?")
+  end
+
+  it "has correct conditional for" do
+    expect(question.conditional_for).to eq({
+      "age1" => [0],
+    })
+  end
+
+  it "has the correct hidden_in_check_answers" do
+    expect(question.hidden_in_check_answers).to eq(
+      {
+        "depends_on" => [
+          {
+            "age1_known" => 0,
+          },
+          {
+            "age1_known" => 1,
+          },
+        ],
+      },
+    )
+  end
+
+  it "has the correct check_answers_card_number" do
+    expect(question.check_answers_card_number).to eq(1)
+  end
+
+  context "with 2023/24 form" do
+    it "has the correct hint" do
+      expect(question.hint_text).to eq("The ’lead’ or ’main’ tenant is the person in the household who does the most paid work. If several people do the same paid work, the lead tenant is whoever is the oldest.")
+    end
+  end
+
+  context "with 2024/25 form" do
+    before do
+      allow(form).to receive(:start_year_after_2024?).and_return(true)
+    end
+
+    it "has the correct hint" do
+      expect(question.hint_text).to eq("The ’lead’ or ’main’ tenant is the person in the household who does the most paid work. If several people do the same amount of paid work, the lead tenant is whoever is the oldest.")
+    end
+  end
+end