In Jainism, there is no “age of Nirvana.” Nirvana (moksha) is a state of eternal, perfect liberation of the soul from all karmic bonds, and it is not measured in years or time. A soul attains moksha when all karma is shed, and that liberated state is beyond worldly time and cycles.

Both main Jain traditions (Digambar and Shwetambar) affirm that moksha is a permanent, time-transcending release, not an age or a moment bounded by a date.

You can read more about Moksha and its nature here