There is no "tornado" on Jupiter in the way we think of it on Earth. The Great Red Spot is a giant storm that has been raging for centuries, but it's not a true tornado. It's more accurately described as a high-pressure anticyclone.

While we don't know the exact age of the Great Red Spot, it's been observed for at least 150 years. It's likely been around much longer than that, but we only have reliable observations going back that far.