diff --git a/app/models/form/lettings/questions/person_partner.rb b/app/models/form/lettings/questions/person_partner.rb
index 4835f1886..b2ca10e02 100644
--- a/app/models/form/lettings/questions/person_partner.rb
+++ b/app/models/form/lettings/questions/person_partner.rb
@@ -35,6 +35,6 @@ class Form::Lettings::Questions::PersonPartner < ::Form::Question
   end
 
   def derived?(log)
-    form.start_year_2026_or_later? && log.is_person_under_16(@person_index)
+    form.start_year_2026_or_later? && log.is_person_under_16?(@person_index)
   end
 end
diff --git a/app/models/lettings_log.rb b/app/models/lettings_log.rb
index 9963e8461..9f014473d 100644
--- a/app/models/lettings_log.rb
+++ b/app/models/lettings_log.rb
@@ -445,7 +445,7 @@ class LettingsLog < Log
     unittype_gn_changed? && unittype_gn_was == 2
   end
 
-  def is_person_under_16(person_index)
+  def is_person_under_16?(person_index)
     public_send("age#{person_index}") && public_send("age#{person_index}") < 16
   end