What causes a PDF to wear out overtime?

A PDF (Portable Document Format) can "wear out" over time primarily due to digital decay, which includes factors like data corruption, software incompatibility, or bit rot, where the storage medium deteriorates. Additionally, as technology evolves, older PDF versions may become unsupported or less accessible, leading to potential loss of functionality. Frequent editing or conversions can also compromise the integrity of the document. Lastly, extensive use and sharing can lead to version discrepancies and loss of quality.