The preface mentions that the Laghu Guru Charitra by Saraswati Gangadhar is older than the Brihad Guru Charitra. Can you tell me more about it?

This premise is incorrect according to the text in Chapter 0. The preface clarifies that the Laghu Guru Charitra is a separate and distinct work from the Brihad Guru Charitra, which was authored by Saraswati Gangadhar. The text does not attribute the Laghu Guru Charitra to Saraswati Gangadhar. It states this work appears to be "much older than the Thorale Guru Charitra" (Brihad Guru Charitra) and consists of 707 verses. As noted in Chapter 0, while its protagonist is the same, Shri Samarth Sadguru Narsimha Saraswati Maharaj, the source does not provide further details on its contents beyond its existence and length.