Content Decay
Content decay is the gradual traffic loss an article suffers as it ages. Facts go stale, competitors publish fresher work, and search intent shifts. The page did not get worse, but its relative standing did, and rankings follow relative standing.
Why it matters for your rankings
Decay is the reason content marketing stops compounding for most teams. They publish continuously while their existing library quietly erodes, so total traffic plateaus even though output never slowed.
The arithmetic favours refreshing heavily. Updating a post that already ranks on page one costs a fraction of what a new article costs and usually returns more traffic, because the page has existing links and history. Decay is also predictable enough to schedule. Anything containing a year, a price, a tool screenshot or a statistic has a known shelf life. Building a refresh cadence around those pages turns an invisible loss into routine maintenance, and it is the single highest-return habit in most content programmes.
How to check it on your site
Find the decliners
In Search Console compare the last 3 months against the same period last year. Sort by clicks lost. Those pages are decaying now.
Diagnose before rewriting
Check whether the SERP changed format, whether a competitor published something better, or whether your facts are simply out of date. Each needs a different fix.
Update substantively
Refresh statistics, screenshots and examples, add what competitors now cover, and remove what is no longer true. Changing the date alone does nothing.
Re-request indexing
After a meaningful update, submit the URL in Search Console so the change is picked up promptly rather than at the next natural crawl.