Subversion 1.9.0 is 4 years old today (release on August 5 2015). http://subversion.apache.org/roadmap.html#release-planning says that each LTS release is supported for 4 years.
Julian said on IRC that perhaps we decided to support 2 LTS releases for either 4 years or until another LTS release appears. Which means 1.9 would still be supported until 1.14 is released. But do we really want to continue supporting 1.9? Do we really want to support two LTS releases at once? I think this situation arose only because 1.9 got caught in the transition phase towards our new release planning guidelines. SVN 1.10 has been picked up by the latest Debian-stable release and also appears to be included in the upcoming CentOS 8 (which will match RHEL 8, as far as I know). Those two operating systems have always been the ones shipping the oldest possible SVN release, as far as I can remember. So if they don't need Subversion 1.9, I don't see any reason for us to support it beyond its 4 years lifetime promised on our web site.
