As per the Census of 2011, the share of the population below the age of $35\text{ years}$ in India is approximately:

According to the 2011 Census data, India possesses one of the youngest populations globally. Demographic distributions show that about $30\%$ of the population falls in the $0-14$ age bracket, $19\%$ in the $15-24$ bracket, and $16\%$ in the $25-34$ bracket. Combining these segments reveals that nearly $65\%$ of India's total population is under the age of $35\text{ years}$.