The centremost structure was stone, an impossibly ancient palace built high up on a hil overlooking the lake.

She was impossibly ancient.

"Ashes to ashes," Donatien croaked in an impossibly ancient voice.

Suddenly he no longer seemed like some impossibly ancient predator, but a man.

The Earthlings' arrival rekindles an impossibly ancient feud a deadly conflict between two highly evolved civilizations.

He reveals his true form (an impossibly ancient, dying man), explaining that he is not immortal, and needs someone to carry on his "work" once he can no longer do it himself.

Other, similarly massive shapes were visible in the distance, conversing with one another in long, eerily beautiful bioelectrical discharges, sharing their impossibly ancient, ineffable thoughts.

There were tales of cities impossibly ancient buried beneath the gravel dunes.

That impossibly ancient figure seemed to be part man, part machine.

He calls himself the Dutchman, I believe, after some impossibly ancient legend from old Earth.