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Adjective: ageless  eyj-lus
  1. Continuing forever or indefinitely
    "the ageless themes of love and revenge";
    - aeonian, eonian [N. Amer], eternal, everlasting, perpetual, unending, unceasing, eviternal [archaic]
     
  2. Not growing old or showing signs of age
    "She had an ageless beauty";
    - unaging, unageing

See also: lasting, permanent