diff --git a/app/services/csv/lettings_log_csv_service.rb b/app/services/csv/lettings_log_csv_service.rb
index c42d736d7..f5894891e 100644
--- a/app/services/csv/lettings_log_csv_service.rb
+++ b/app/services/csv/lettings_log_csv_service.rb
@@ -127,7 +127,7 @@ module Csv
     }.freeze
 
     AGE_KNOWN_FIELDS = {}.tap { |hash|
-      (2..8).each do |i|
+      (1..8).each do |i|
         hash["age#{i}"] = { "age_known_field" => "age#{i}_known" }
       end
     }.freeze
diff --git a/app/services/csv/sales_log_csv_service.rb b/app/services/csv/sales_log_csv_service.rb
index 63140df34..2720a3994 100644
--- a/app/services/csv/sales_log_csv_service.rb
+++ b/app/services/csv/sales_log_csv_service.rb
@@ -58,7 +58,7 @@ module Csv
     }.freeze
 
     AGE_KNOWN_FIELDS = {}.tap { |hash|
-      (2..6).each do |i|
+      (1..6).each do |i|
         hash["age#{i}"] = { "age_known_field" => "age#{i}_known" }
       end
     }.freeze