Registration age measures the interval since the registry's published creation event. It does not establish when a website first went online, when email service began, or when the current holder acquired the name. Transfers commonly preserve the original event, while deletion and later re-registration can produce a new one.
The day count is the most reproducible output because months and years have different lengths. The interface computes complete calendar months and derives complete years from that total, while retaining the exact normalized timestamp in the RDAP details below the calculation.
Use age as a prompt for more evidence
A domain registered yesterday deserves more context before a high-value transaction, but age does not make an accusation. New products, events, and organizations start every day. Conversely, an attacker can compromise an old site or purchase an established domain whose history looks reassuring.
Inspect the complete record with the WHOIS/RDAP lookup, or combine age with mail and authentication evidence in the domain reputation checker. Neither should replace direct verification of the party you intend to trust.