The Unity Age is an in-character term for the period when psions are largely active. This timeframe is largely the focus for the Trinity game line, thus it is also known out-of-character as the Trinity Era, or thematically as the Age of Unity.
The Unity Age begins with the creation of the eight proxies in 2102. It lasts to at least the present day, in 2122.
See also: Inspiration Age, Nova Age