Determine a domain's age from registration data and archival history — tries RDAP, then port-43 WHOIS, then a Wayback-based estimate (age_source: rdap | whois | wayback_estimate | null), returning creation date, age in years, first Wayback Machine capture, total archived snapshots, and a maturity signal so agents can assess domain trustworthiness and detect freshly registered domains used for fraud or phishing — including .io and other TLDs without public RDAP.