Answer

There is no single fixed number of “old Jain books.”

If you mean the Śvetāmbara Jain Agamas, they are traditionally counted as 45 texts. If you mean all ancient Jain literature, then the number is much larger—there are many hundreds of scriptures, commentaries, philosophical works, stotras, and historical texts.

Explanation

Jain literature is not counted the same way in every tradition.

• Śvetāmbara tradition: preserves a traditional canon often counted as 45 Agamic texts
• Digambara tradition: accepts a different scriptural tradition and many important works are preserved as later classical texts
• Beyond these, Jain scholars also preserve many commentaries, treatises, and devotional works

So the answer depends on what you mean by “old Jain books.”

Spiritual Understanding

In Jain Dharma, the value of a text is not only in its number, but in its ability to guide a soul toward:

• Ahimsa
• Self-discipline
• Non-attachment
• Right faith, right knowledge, and right conduct

Takeaway

So, in short: the old Jain books are not counted as just one fixed number. For the Śvetāmbara Agamas, the traditional count is 45; for Jain literature overall, there are many more.