Answer

“Jainam Jayati Shasanam” is a well-known Jain devotional phrase meaning:

“May the Jain Shasan be victorious.”

However, if you are asking about a specific stotra named “Jainam Jayati Shasanam Stotra”, its exact historical age is not clearly established in widely accepted Jain tradition.

Explanation

The phrase “Jainam Jayati Shasanam” is commonly used with devotion and reverence for the Jain Shasan — the spiritual order and teachings of the Jinas.

But the precise date, author, and age of a stotra by this exact title are not something I can state with certainty unless it is identified from a specific Jain text, tradition, manuscript, or published collection.

Spiritual Understanding

The phrase expresses deep faith in the eternal truth of the Jina’s teachings. In Jain Dharma, “Shasan” refers to the path taught by the Tirthankars — centered on:

• Ahimsa
• Samyak Darshan
• Samyak Jnan
• Samyak Charitra
• Liberation from karma

Takeaway

The exact age of the specific stotra is not clearly established within Jain tradition. But the devotional sentiment of “Jainam Jayati Shasanam” is deeply respected in Jain Dharma.