Dracula
Count Dracula presents documented existence spanning from the fifteenth century to the present day. This five-century tenure establishes him as one of history's most enduring individual entities. Unlike mortal villains who must eventually yield to biological inevitability, the Count has watched generations of adversaries age and perish whilst he remains unchanged.
His immortality requires only periodic biological inputs, haemoglobin extraction proving remarkably sustainable as operational models go. The vampire has survived wooden stakes, holy water, Van Helsing's entire arsenal, and the complete transformation of human civilisation from feudal kingdoms to digital networks. Barring extremely specific countermeasures, his continuity appears genuinely indefinite, a persistence that no mortal villain can approximate.
The Joker
The Joker's longevity, whilst impressive by human standards, remains fundamentally constrained by mortality. His criminal career spans perhaps three to four decades of active terrorisation, depending upon which continuity scholars privilege. During this period, he has survived encounters that would have ended ordinary criminals: beatings from Batman, exposure to his own chemical compounds, and multiple apparent deaths.
Yet the Clown Prince of Crime ages, however slowly his deterioration appears to progress. His psychological resilience masks what must inevitably become biological decline. Whilst the Joker has demonstrated remarkable capacity for resurrection in narrative terms, his existence depends entirely upon continued survival of fragile human physiology. The Count need only wait, patient across centuries, for time to accomplish what direct confrontation cannot.