Procrastination
Procrastination's documented history extends to the earliest human civilisations. Ancient Greek philosophers coined akrasia to describe weakness of will, whilst Roman texts lament the postponement of important duties. This represents a minimum operational lifespan of 2,500 years of documented activity.
The phenomenon shows no signs of diminishment. Indeed, modern conditions appear to have strengthened its prevalence. Unlike entities subject to fashion cycles, procrastination's relevance only increases as societies generate more tasks requiring completion.