giganotosaurus age

No clue. If I had to guess, I'd say about the same age range as Sue though, late 20's/early 30's at the most.

Yes, based off the size. I could see Giga averaging slightly smaller than Sue, but getting to the size of those two. 

It could. That would be interesting to just how old those two were when they died.

Based off of growth rings in the bones, size, and a number of other tactics, scientists determined that large theropods overall would probably live 30 years max. So, Giganotosaurus would have likely lived about 25-30 years.

Oh, and it also depends on if they died naturally, or from disease, another dinosaur, starvation, etc.

It still may have been adult that just died before it reached its max age. Either way, assuming they were adults of full size, they were probably at least 25 years old.

Most likely. I see the same age as Sue personally.

I agree with that.

We can never know exactly. But my best guess is the same: 20-25 years when they died.