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。

She is an old hand at photography so many girls approach her for photo shoots.
她是摄影老手了，很多女孩子都找她拍照。