Before Present is a term used to describe the time elapsed since the beginning of human civilization, which is roughly estimated to be around 10,000 years ago. Therefore, antonyms for 'Before Present' would necessarily refer to periods, events or objects that are historically post-civilization. Some possible antonyms may include modern times, the digital age, contemporary era, space age, post-industrial era or post-modern era. However, as the term 'Before Present' is specifically used to refer to time periods in paleontology, anthropology, and geology, antonyms need to be accurately contextualized to represent a period after the establishment of modern human society.