Every estate has a birth rate. Someone can tell you, to the week, how many pages went live last quarter. Publishing is measured, celebrated, dashboarded. Almost no estate has a death rate. Ask how many pages were retired in the same quarter and the number, if it exists at all, is close to zero.
That asymmetry has a name. The Publish-to-Retire Ratio is how many pages an estate publishes for every one it retires over a period. A team that shipped forty pages and retired none is not running forty to one. It is running a ratio with nothing under the line: an estate that can only grow, with no mechanism that would ever make it smaller.
This is why estates fail by accumulation, not by error. Nobody publishes something wrong on purpose, and nobody deletes something important by mistake. The estate ages because it only ever adds. Every page that stops being true stays where it is, live, indexed and retrieved, because retiring it was never anyone’s job and never appeared on a plan.
The ratio predicts ageing because it measures direction, not symptoms. A health score tells you where an estate is now; the ratio tells you where it is going. An estate publishing fast and retiring nothing will age however good today’s number looks, because it is loading itself with pages that are stale in eighteen months and unowned in twenty-four. A rising publish rate on a flat retirement rate is not productivity. It is the decay curve, drawn in advance.
An estate that never retires isn’t growing. It’s hoarding.
The fix is not a purge, and it is not an annual audit; an audit is a photograph of a moving thing. It is making retirement a planned act rather than an accident: a standing rule for what stops being published when it stops being true, and a ratio the estate is held to. A governed estate keeps a deliberate ratio the way a healthy forest keeps a fire cycle. The letting-go is the health.
The hard part is knowing a page’s age. Rita does not guess it. She reads a page twice and compares what is on it; failing that, she watches for how long it has stayed the same; failing that, she uses the date the page declares for itself; and when none of those exist she says that freshness is not known. The Assessment reports your ratio from your estate’s archive, labelled as inferred, and shows a dash where it cannot be measured.