Vinu is little older. Savi said that he is older so why would he want to be her friend. Then Vinayak says he is her friend & so they are same age.
At younger age even a few months difference is visible. Some kids are taller and bigger than others. My son used to be at least a head taller than most of the kindergartners. So it is possible as Vinu said in his IV that he is Sairat's son.

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