First, I need to confirm the availability of official Tamil dubbed versions. Avengers: Endgame was dubbed into several languages, and Tamil is likely one of them. But the "old Iron Man voice" part is tricky. I know that in some dubbed versions, they might keep the original voice for key characters, especially if they have iconic catchphrases like "I am Iron Man." So maybe in the Tamil dubbed version, Tony's voice remains similar to the original to preserve that aspect.