ageless

adj

1. Having existed for so great a period of time that its longevity cannot be expressed.

   “The ageless pyramids stood prominently against the sunset.”

2. Continuing infinitely or indefinitely.

   “This memorial will show our ageless respect to those who died.”

3. Always appearing youthful; never seeming to age.

   “her ageless face”

   “As United finally started to pose a threat, Darren Fletcher headed straight at City keeper Hart from Ryan Giggs' cross - and the seemingly ageless Old Trafford veteran was instrumental when they took the lead four minutes before the interval.”