72% are of Indo-Aryan descent and 25% are of Dravidian descent who speak a Dravidian language (e.g. Tamil), which is widely spoken in the south.

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India has the world’s largest population. It has a large youth population, with an average age of approximately 28.
Among them, the largest demographic group is Generation Z (approximately 377 million people), who are set to become the driving force behind India’s future society and economy.
This article explores the lifestyles and values of India’s Generation Z.
 
The Values and Lifestyle of India's Generation Z Part 1: What Are the Values of India's Generation Z?
・Values: What matters most in life
・Activities I want to spend more time on

Central Intelligence Agency "The World Factbook: Ethnic groups" Retrieved June 19, 2020, from https://bit.ly/2NvB0Qc