[root@10-0-42-136 wal_archive]# ll -a
total 131080
drwxr-xr-x 2 database database     4096 Oct 27 20:37 .
drwxr-xr-x 4 root     root         4096 Oct 26 17:31 ..
-rw------- 1 database database 16777216 Oct 26 17:36 000000010000000000000001
-rw------- 1 database database 16777216 Oct 26 17:51 000000010000000000000002
-rw------- 1 database database 16777216 Oct 27 16:04 000000010000000000000003
-rw------- 1 database database 16777216 Oct 27 19:42 000000010000000000000004
-rw------- 1 database database 16777216 Oct 27 19:46 000000010000000000000005
-rw------- 1 database database 16777216 Oct 27 20:05 000000010000000000000006
-rw------- 1 database database 16777216 Oct 27 20:27 000000010000000000000007
-rw------- 1 database database 16777216 Oct 27 20:37 000000010000000000000008

[root@10-0-42-136 wal_archive]# find /var/lib/postgresql/data/wal_archive -type f -mtime +3  ;
/var/lib/postgresql/data/wal_archive/000000010000000000000001
/var/lib/postgresql/data/wal_archive/000000010000000000000002

find /var/lib/postgresql/data/wal_archive -type f -mtime +3  -exec rm -f {} \;