> the XML specification has been at version 1.1 for 17 years as well
ISO 8879 (SGML), which XML is a subset of, was ratified in 1986 already, making it closer to X11.
Also, you may want to check what XML 1.1 as opposed to 1.0 is about [1] - the vast vast majority of XML is 1.0 and has no reason to ever declare itself as 1.1 and in fact, every reason not to.
The CEE/7 standard was last revised in 1983 and is used by hundreds of millions of people every day.