Final answer:
Suresh is the youngest among Mohan, Prabir, Suresh, and Mihir, based on the given information about their relative ages.
Step-by-step explanation:
The youngest person among the four is Suresh.
Based on the information provided, we can determine the relative ages of Mohan, Prabir, Suresh, and Mihir. Mohan is older than Prabir, Suresh is younger than Prabir, and Mihir is older than Suresh but younger than Prabir.
Therefore, the age order from oldest to youngest is: Mohan, Prabir, Mihir, and Suresh. Since Suresh is mentioned as being younger than both Prabir and Mihir, he is the youngest among the four.