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Definition of dateless : Without date; having no fixed time.

Synonyms:

interminable, aged, ongoing, everlasting, hoar, undatable, infinite, unending, undated, age-old, eterne, antique, eternal, unchanged, continuing, ageless, deathless, perennial, timeless, antediluvian, permanent, ceaseless, endless, hoary, change, imperishable, lasting, immemorial, unaltered, immortal, venerable, enduring, perpetual, sempiternal, undying, old

Usage examples:

• Even if it is " mere superstition" it has a dateless history. - "Folklore as an Historical Science", George Laurence Gomme.
• Ah, dateless when, For youth shall perish among men, And Spring herself be ancient then. - "The Strange Story Book", Mrs. Andrew Lang.
• We, however, give the following from Cop's Tobacco Plant, descriptive of the part played by tobacco on the stage two centuries ago: The 'Return from Parnassus' was published anonymously, and the copy I have used is dateless. - "Tobacco; Its History, Varieties, Culture, Manufacture and Commerce", E. R. Billings.