diff --git a/app/models/sales_log.rb b/app/models/sales_log.rb
index daea6f060..fa161ce80 100644
--- a/app/models/sales_log.rb
+++ b/app/models/sales_log.rb
@@ -221,4 +221,14 @@ class SalesLog < Log
   def shared_owhership_scheme?
     ownershipsch == 1
   end
+
+  def buyers_age_for_old_persons_shared_ownership_invalid?
+    return unless old_persons_shared_ownership?
+
+    (joint_purchase? && ages_unknown_or_under_64?([1, 2])) || (not_joint_purchase? && ages_unknown_or_under_64?([1]))
+  end
+
+  def ages_unknown_or_under_64?(person_indexes)
+    person_indexes.all? { |person_num| self["age#{person_num}"].present? && self["age#{person_num}"] < 64 || self["age#{person_num}_known"] == 1 }
+  end
 end
diff --git a/app/models/validations/sales/household_validations.rb b/app/models/validations/sales/household_validations.rb
index 8c03d9db9..4f2290268 100644
--- a/app/models/validations/sales/household_validations.rb
+++ b/app/models/validations/sales/household_validations.rb
@@ -18,20 +18,6 @@ module Validations::Sales::HouseholdValidations
     shared_validate_partner_count(record, 6)
   end
 
-  def validate_buyers_age_for_old_persons_shared_ownership(record)
-    if record.old_persons_shared_ownership?
-      if record.joint_purchase? && ages_unknown_or_under_64?(record, [1, 2])
-        record.errors.add :age1, I18n.t("validations.household.old_persons_shared_ownership")
-        record.errors.add :age2, I18n.t("validations.household.old_persons_shared_ownership")
-        record.errors.add :type, I18n.t("validations.household.old_persons_shared_ownership")
-      end
-      if record.not_joint_purchase? && ages_unknown_or_under_64?(record, [1])
-        record.errors.add :age1, I18n.t("validations.household.old_persons_shared_ownership")
-        record.errors.add :type, I18n.t("validations.household.old_persons_shared_ownership")
-      end
-    end
-  end
-
   def validate_previous_postcode(record)
     return unless record.postcode_full && record.ppostcode_full && record.discounted_ownership_sale?
 
@@ -116,8 +102,4 @@ private
   def tenant_is_economic_child?(economic_status)
     economic_status == 9
   end
-
-  def ages_unknown_or_under_64?(record, person_indexes)
-    person_indexes.all? { |person_num| record["age#{person_num}"].present? && record["age#{person_num}"] < 64 || record["age#{person_num}_known"] == 1 }
-  end
 end
diff --git a/spec/models/validations/sales/household_validations_spec.rb b/spec/models/validations/sales/household_validations_spec.rb
index 5b227c36d..26d369a35 100644
--- a/spec/models/validations/sales/household_validations_spec.rb
+++ b/spec/models/validations/sales/household_validations_spec.rb
@@ -164,121 +164,6 @@ RSpec.describe Validations::Sales::HouseholdValidations do
       expect(record.errors["ecstat2"])
         .to include(match I18n.t("validations.household.ecstat.student_16_19.cannot_be_student.child_not_16_19"))
     end
-
-    context "when it is a joint purchase and both buyers are over 64" do
-      let(:record) { FactoryBot.build(:sales_log, jointpur: 1, age1: 65, age2: 66, type: 24) }
-
-      it "does not add an error" do
-        household_validator.validate_buyers_age_for_old_persons_shared_ownership(record)
-
-        expect(record.errors).not_to be_present
-      end
-    end
-
-    context "when it is a joint purchase and first buyer is over 64" do
-      let(:record) { FactoryBot.build(:sales_log, jointpur: 1, age1: 65, age2: 40, type: 24) }
-
-      it "does not add an error" do
-        household_validator.validate_buyers_age_for_old_persons_shared_ownership(record)
-
-        expect(record.errors).not_to be_present
-      end
-    end
-
-    context "when it is a joint purchase and second buyer is over 64" do
-      let(:record) { FactoryBot.build(:sales_log, jointpur: 1, age1: 43, age2: 64, type: 24) }
-
-      it "does not add an error" do
-        household_validator.validate_buyers_age_for_old_persons_shared_ownership(record)
-
-        expect(record.errors).not_to be_present
-      end
-    end
-
-    context "when it is a joint purchase and neither of the buyers are over 64" do
-      let(:record) { FactoryBot.build(:sales_log, jointpur: 1, age1: 43, age2: 33, type: 24) }
-
-      it "adds an error" do
-        household_validator.validate_buyers_age_for_old_persons_shared_ownership(record)
-
-        expect(record.errors["age1"])
-        .to include(match I18n.t("validations.household.old_persons_shared_ownership"))
-        expect(record.errors["age2"])
-        .to include(match I18n.t("validations.household.old_persons_shared_ownership"))
-        expect(record.errors["type"])
-        .to include(match I18n.t("validations.household.old_persons_shared_ownership"))
-      end
-    end
-
-    context "when it is a joint purchase and first buyer is under 64 and the second buyers' age is unknown" do
-      let(:record) { FactoryBot.build(:sales_log, jointpur: 1, age1: 43, age2_known: 1, type: 24) }
-
-      it "adds an error" do
-        household_validator.validate_buyers_age_for_old_persons_shared_ownership(record)
-
-        expect(record.errors["age1"])
-        .to include(match I18n.t("validations.household.old_persons_shared_ownership"))
-        expect(record.errors["age2"])
-        .to include(match I18n.t("validations.household.old_persons_shared_ownership"))
-        expect(record.errors["type"])
-        .to include(match I18n.t("validations.household.old_persons_shared_ownership"))
-      end
-    end
-
-    context "when it is a joint purchase and neither of the buyers ages are known" do
-      let(:record) { FactoryBot.build(:sales_log, jointpur: 1, age1_known: 1, age2_known: 1, type: 24) }
-
-      it "adds an error" do
-        household_validator.validate_buyers_age_for_old_persons_shared_ownership(record)
-
-        expect(record.errors["age1"])
-        .to include(match I18n.t("validations.household.old_persons_shared_ownership"))
-        expect(record.errors["age2"])
-        .to include(match I18n.t("validations.household.old_persons_shared_ownership"))
-        expect(record.errors["type"])
-        .to include(match I18n.t("validations.household.old_persons_shared_ownership"))
-      end
-    end
-
-    context "when it is not a joint purchase and the buyer is over 64" do
-      let(:record) { FactoryBot.build(:sales_log, jointpur: 2, age1: 70, type: 24) }
-
-      it "does not add an error" do
-        household_validator.validate_buyers_age_for_old_persons_shared_ownership(record)
-
-        expect(record.errors).not_to be_present
-      end
-    end
-
-    context "when it is not a joint purchase and the buyer is under 64" do
-      let(:record) { FactoryBot.build(:sales_log, jointpur: 2, age1: 20, type: 24) }
-
-      it "adds an error" do
-        household_validator.validate_buyers_age_for_old_persons_shared_ownership(record)
-
-        expect(record.errors["age1"])
-        .to include(match I18n.t("validations.household.old_persons_shared_ownership"))
-        expect(record.errors["age2"])
-        .to be_empty
-        expect(record.errors["type"])
-        .to include(match I18n.t("validations.household.old_persons_shared_ownership"))
-      end
-    end
-
-    context "when it is not a joint purchase and the buyers age is not known" do
-      let(:record) { FactoryBot.build(:sales_log, jointpur: 2, age1_known: 1, type: 24) }
-
-      it "adds an error" do
-        household_validator.validate_buyers_age_for_old_persons_shared_ownership(record)
-
-        expect(record.errors["age1"])
-        .to include(match I18n.t("validations.household.old_persons_shared_ownership"))
-        expect(record.errors["age2"])
-        .to be_empty
-        expect(record.errors["type"])
-        .to include(match I18n.t("validations.household.old_persons_shared_ownership"))
-      end
-    end
   end
 
   describe "previous postcode validations" do
diff --git a/spec/models/validations/soft_validations_spec.rb b/spec/models/validations/soft_validations_spec.rb
index 93ed01a20..9ca9436fb 100644
--- a/spec/models/validations/soft_validations_spec.rb
+++ b/spec/models/validations/soft_validations_spec.rb
@@ -237,4 +237,78 @@ RSpec.describe Validations::SoftValidations do
       end
     end
   end
+
+  describe "old persons shared ownership soft validations" do
+    context "when it is a joint purchase and both buyers are over 64" do
+      let(:record) { FactoryBot.build(:sales_log, jointpur: 1, age1: 65, age2: 66, type: 24) }
+
+      it "returns false" do
+        expect(record.buyers_age_for_old_persons_shared_ownership_invalid?).to be false
+      end
+    end
+
+    context "when it is a joint purchase and first buyer is over 64" do
+      let(:record) { FactoryBot.build(:sales_log, jointpur: 1, age1: 65, age2: 40, type: 24) }
+
+      it "returns false" do
+        expect(record.buyers_age_for_old_persons_shared_ownership_invalid?).to be false
+      end
+    end
+
+    context "when it is a joint purchase and second buyer is over 64" do
+      let(:record) { FactoryBot.build(:sales_log, jointpur: 1, age1: 43, age2: 64, type: 24) }
+
+      it "returns false" do
+        expect(record.buyers_age_for_old_persons_shared_ownership_invalid?).to be false
+      end
+    end
+
+    context "when it is a joint purchase and neither of the buyers are over 64" do
+      let(:record) { FactoryBot.build(:sales_log, jointpur: 1, age1: 43, age2: 33, type: 24) }
+
+      it "returns true" do
+        expect(record.buyers_age_for_old_persons_shared_ownership_invalid?).to be true
+      end
+    end
+
+    context "when it is a joint purchase and first buyer is under 64 and the second buyers' age is unknown" do
+      let(:record) { FactoryBot.build(:sales_log, jointpur: 1, age1: 43, age2_known: 1, type: 24) }
+
+      it "returns true" do
+        expect(record.buyers_age_for_old_persons_shared_ownership_invalid?).to be true
+      end
+    end
+
+    context "when it is a joint purchase and neither of the buyers ages are known" do
+      let(:record) { FactoryBot.build(:sales_log, jointpur: 1, age1_known: 1, age2_known: 1, type: 24) }
+
+      it "returns true" do
+        expect(record.buyers_age_for_old_persons_shared_ownership_invalid?).to be true
+      end
+    end
+
+    context "when it is not a joint purchase and the buyer is over 64" do
+      let(:record) { FactoryBot.build(:sales_log, jointpur: 2, age1: 70, type: 24) }
+
+      it "returns false" do
+        expect(record.buyers_age_for_old_persons_shared_ownership_invalid?).to be false
+      end
+    end
+
+    context "when it is not a joint purchase and the buyer is under 64" do
+      let(:record) { FactoryBot.build(:sales_log, jointpur: 2, age1: 20, type: 24) }
+
+      it "returns true" do
+        expect(record.buyers_age_for_old_persons_shared_ownership_invalid?).to be true
+      end
+    end
+
+    context "when it is not a joint purchase and the buyers age is not known" do
+      let(:record) { FactoryBot.build(:sales_log, jointpur: 2, age1_known: 1, type: 24) }
+
+      it "returns true" do
+        expect(record.buyers_age_for_old_persons_shared_ownership_invalid?).to be true
+      end
+    end
+  end
 end