The youngest person to ever serve as the President of India is Neelam Sanjiva Reddy. He was inaugurated at the age of 63.
While this might not seem incredibly young compared to some other world leaders, it's important to note that the age of Indian presidents has varied throughout history. Some have assumed office at older ages. Neelam Sanjiva Reddy's presidency remains noteworthy for his comparatively younger age at the time of his inauguration.
Further research into Indian presidential history can provide more detailed information on the ages of each president and their respective terms in office.
You can explore additional information on Indian presidents through official government websites and reputable historical resources.
For a comprehensive list of Indian Presidents and their ages at inauguration, you might find reliable information on the official website of the President of India or through resources like Britannica's page on the Indian government.