With Google Panda algorithm thoroughly searches the internet to find pages that don't match to its quality standards and penalizes websites with substandard content. Because of this, many websites become the victim with their old contents that back then weren't optimized with SEO. Panda algorithm is one of the main Google algorithms, and its updating quite regularly. There's an opinion that said content that have been around quite long time doesn't matter, with assumption that Google with its Panda algorithm knows that older content is usually ignored by readers and is may not still relevant.
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