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Account age
New account Created < 30 days ago
Recent account Created < 1 year ago
Established account Created 1+ year ago
Derived straight from the account's numeric ID — no external lookup.
A tilde (~) means the id predates X's Snowflake ID scheme, so the date
is an estimate, not an exact decode. "Unknown" means the id falls in a
gap we have no reliable way to date at all.