B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Recent
39%
39% -- share of impacted pages deindexed due to outdated content for pages impacted by Google December 2025 Core Update (2025-12)
According to ALM Corp's analysis of Google's December 2025 Core Update, outdated content contributed to deindexing on 39% of impacted pages.
Attribution:
View source
Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
39%
Unit
Percentage
Data Vintage
2025-12
Entity
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
50
Source Trust
60
Citation Chain
60
Independence
30
Methodology
45
Freshness
95
Source
ALM Corp
Primary
Tier C
https://wpvibes.com/blog/outdated-wordpress-content/ ↗
Source Article
Outdated Website Content: 6 Ways It's Hurting Your Site
A visitor lands on your blog post. They see it was last updated in 2021. They read a statistic attributed to a study from five years ago. The screenshot shows an interface that looks nothing like the tool they’re using today. They click back and find a competitor’s article instead.
That is the real …
Original Research
ALM Corp
· Original study ↗
Methodology
ALM Corp analysis of Google's December 2025 Core Update, as cited by WPVibes
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
pages impacted by Google December 2025 Core Update: 39% share of impacted pages deindexed due to outdated content. Source: ALM Corp (2025-12). Via Lighthouse Intelligence -- https://lighthousedata.io/data/core-update-deindexing-39pct
HTML Embed
<blockquote cite="https://lighthousedata.io/data/core-update-deindexing-39pct" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>39%</strong> -- share of impacted pages deindexed due to outdated content for pages impacted by Google December 2025 Core Update<br><small>Source: ALM Corp (2025-12) · <a href="https://lighthousedata.io/data/core-update-deindexing-39pct" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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