Fix indentation and extract a case_log method

app/models/case_log.rb

@@ -219,6 +219,10 @@ class CaseLog < ApplicationRecord
     rent_type == 2 || rent_type == 4
   end
 
+  def previous_tenancy_was_foster_care?
+    prevten == 13
+  end
+
 private
 
   PIO = Postcodes::IO.new

app/models/validations/household_validations.rb

@@ -65,7 +65,7 @@ module Validations::HouseholdValidations
       record.errors.add :prevten, I18n.t("validations.household.prevten.non_temp_accommodation")
     end
 
-    if record.age1.present? && record.age1 > 19 && record.prevten == 13
+    if record.age1.present? && record.age1 > 19 && record.previous_tenancy_was_foster_care?
       record.errors.add :prevten, I18n.t("validations.household.prevten.over_20_foster_care")
       record.errors.add :age1, I18n.t("validations.household.age.lead.over_20")
     end