We should try addressing another issue, there shouldn't be expiring skills in the first place. A lot of the tools and software that are being called "expired skills" aren't even old enough or mature enough to expire in the first place.

There are eight new frameworks for every new language someone invents every few years, which is ridiculous. It can take decades for software to mature to the point where it is reasonably stable and secure. It takes millions of collective man hours to write the software, millions more man hours to fully document it and then people spend their whole lives maintaining and defending the software from attackers. People get burned out and all that effort gets wasted so people can create a new "skill".