Slackware 13.x EOL in July

Patrick has been supporting older Slackware releases for more than 7 years and it's getting harder to push updates for those releases as their base libraries are too ancient. It will also keep his load high as it might take more time to inspect whether an update affected older releases and trying to build or patch packages to fix those issues.

Well, in the next few months (exactly one day after USA independency day), the support for all Slackware 13.x (13.0, 13.1, and 13.37) will expires and support will only be given to Slackware 14.x and future releases. You can see the notice in the Slackware 13.0 ChangeLog:
Fri Apr  6 20:47:43 UTC 2018
####################################################################
# NOTICE OF INPENDING EOL (END OF LIFE) FOR OLD SLACKWARE VERSIONS #
# #
# Effective July 5, 2018, security patches will no longer be #
# provided for the following versions of Slackware (which will all #
# be more than 7 years old at that time): #
# Slackware 13.0, Slackware 13.1, Slackware 13.37. #
# If you are still running these versions you should consider #
# migrating to a newer version (preferably as recent as possible). #
# Alternately, you may make arrangements to handle your own #
# security patches. #
####################################################################