✨The conclusion: people use these libraries forever (I think 1/3 of all Angular searches on Google are inquiries about Angular1).
✨The problem: outdated versions are less secure, which makes your entire apps/ code more vulnerable.
✨Which in turn means you can handle it in 2 ways:
1️⃣ For developers: ALWAYS update your js libraries.
2️⃣For maintainers: Make sure that the underlying web platform must support aged versions indefinitely.