When I went to secondary school in the 1970s, we learned about Earth’s geological history and how it is divided into ages of different lengths. The teacher explained that we are living in the Holocene epoch of the Quarternary period.
Now there are some serious arguments that Earth in fact entered a new geological age in the mid 20th century, when the modern technological society started to leave significant marks on Earth’s geology and ecology, the so-called Great Acceleration. Appropriately, the proposed name for the new epoch is Anthropocen (derived from the Greek word for “human”) and its start date is supposed to be July 16, 1945. Read more here — link >>>