diff --git a/installer/data/mysql/en/optional/sample_patrons.yml b/installer/data/mysql/en/optional/sample_patrons.yml
index a7baf0d38a..c68b75e58f 100644
--- a/installer/data/mysql/en/optional/sample_patrons.yml
+++ b/installer/data/mysql/en/optional/sample_patrons.yml
@@ -2424,3 +2424,6 @@ tables:
           flags: ~
           sort1: 0.91641750830823
           sort2: 0.27291712562825
+
+sql_statements:
+  - "UPDATE borrowers SET dateofbirth=DATE_SUB(CAST(NOW() AS DATE), INTERVAL 15 YEAR) WHERE categorycode IN ('B', 'J', 'K', 'YA');"