Old head refers to one who ranks in age and experience, especially when in social groups, e.g. a tenured member of an office.

Old head指年齡和經歷都很資深的人，尤其適用于某些社會團體中，比如，某個(政府)辦公室的終身成員，也就是我們所說的(幾屆)“元老”。

For example:

"Kristie is an old head." -In reference to her knowledge and experience with industrial music.

“克里斯蒂是位元老。”——我指的是她在工業(yè)噪音音樂方面的知識和經歷。