What's the Shelf Life of a Good Backlink in 2026?

https://www.scribd.com/document/983199401/How-to-Spot-PBN-Footprints-and-Time-Your-Updates-to-Avoid-Ranking-Disasters-132079

1. Why knowing your backlink's shelf life still matters in 2026 Backlinks aren't a one-time buy-and-forget asset