Core Web Vitals aren’t a standard that sites need to adopt, in the sense you seem to mean. They’re a set of (mostly performance) metrics which quantify specific

Core Web Vitals aren’t a standard that sites need to adopt, in the sense you seem to mean. They’re a set of (mostly performance) metrics which quantify specific aspects of a website each with some presumed impact on user experience. Older content doesn’t need any particular action taken to be measured on these metrics, and in many cases may actually perform rather well (based on certain assumptions about said older content). That Google may (and often does) rank older content poorly is definitely a concern in its own right, but it’s probably not a concern relevant to CWV.