At what point in history did Catholic priests begin to be called pastors?

I have recently, within the last year or so, begun to notice the sometimes reference to Catholic Pastors. I assume that this term is in reference to Priests. I grew up Catholic and attended Catholic school, in 18 years, never heard the term Pastor within that context. Is the term Pastor within the Catholic church synonymous with Priest and, if so, is it's usage recent, regional, or did I just not notice for 18 years? Answers to this question, https://christianity.stackexchange.com/questions/69115/are-roman-catholic-priests-ever-addressed-as-pastor , seem to indicate that this usage is limited to the US only. Does this mean that it's usage within Catholicism is less than 300 years old?