diff --git a/app/models/case_log.rb b/app/models/case_log.rb
index 576078eb8..94b80f2c3 100644
--- a/app/models/case_log.rb
+++ b/app/models/case_log.rb
@@ -433,6 +433,18 @@ class CaseLog < ApplicationRecord
     end
   end
 
+  def age_known?(person_num)
+    return false unless person_num.is_a?(Integer)
+
+    !!public_send("age#{person_num}_known")&.zero?
+  end
+
+  def age_unknown?(person_num)
+    return false unless person_num.is_a?(Integer)
+
+    public_send("age#{person_num}_known") == 1
+  end
+
 private
 
   PIO = Postcodes::IO.new
@@ -568,10 +580,6 @@ private
     public_send("age#{person_num}") && public_send("age#{person_num}") < 16
   end
 
-  def age_known?(person_num)
-    !!public_send("age#{person_num}_known")&.zero?
-  end
-
   def process_postcode_changes!
     self.postcode_full = upcase_and_remove_whitespace(postcode_full)
     process_postcode(postcode_full, "postcode_known", "is_la_inferred", "la")
diff --git a/app/models/validations/household_validations.rb b/app/models/validations/household_validations.rb
index 52d2e9f01..9c291d7e7 100644
--- a/app/models/validations/household_validations.rb
+++ b/app/models/validations/household_validations.rb
@@ -136,7 +136,7 @@ private
     (1..8).any? do |n|
       next if record["sex#{n}"].nil?
 
-      record["sex#{n}"] == "F" && (in_pregnancy_age_range?(record, n) || record["age#{n}_known"] == 1)
+      record["sex#{n}"] == "F" && (in_pregnancy_age_range?(record, n) || record.age_unknown?(n))
     end
   end