old stager 老手，有经验的人，老资格

【例句】
Yet, old stager that he was, after the initial shock he immediately gathered his wits about HIM and shook his head in feigned disbelief.
可是他毕竟是老手，心里一跳以后，也就立刻镇静起来，故意摇头，表示不相信。

Ge You is an old stager in Chinese film industry.
葛优是中国电影界的老戏骨。