Having no known beginning and presumably no end:
— Sempiternal truth.

synonyms: dateless, endless.

Roget 112: perpetual, eternal; everduring^†, everlasting, ever-living, ever-flowing; continual, sempiternal^†; coeternal; endless, unending; ceaseless, incessant, uninterrupted, indesinent^†, unceasing; endless, unending, interminable, having no end; unfading^†, evergreen, amaranthine; neverending^†, never-dying, never-fading; deathless, immortal, undying, imperishable.    ... show more