Sue was oldest, Scotty was a youngster, and nobody knows what gender they were

[suspsy]

An extensive new paper on the tyrant king by Thomas Carr. Among many intriguing conclusions is that sexual dimorphism cannot be determined by skeletal structure, ergo Sue's gender remains unknown. Sue also regains their status as the oldest known T. rex, while the larger Scotty is found to have actually been one of the younger adult specimens.

https://peerj.com/articles/9192/#p-296

Does this mean Scotty might have grown even bigger had they lived longer?

[Dinoxels]

An odd claim about sexual dimorphism, as some T.rex skulls do appear different than others (i.e. Stan and Sue).

[Carnoking]

Wow that is a lot to read, but the possibility that Scotty could have gotten even bigger is an exciting prospect indeed!
I don't have time to read through all of that, but was there anything in there about medullary bone indicating sex, or has that idea been more or less thrown out?

[suspsy]

The medullary bone is indeed still a valid means of determining a T. rex's gender; it is the only means available at present according to Carr's conclusions. The gracile and robust morphs that were once proposed to be indicative of sexual dimorphism are addressed in the paper and found to be inconclusive. So we will probably never know the genders of Scotty, Sue, or any other T. rexes save for those with preserved medullary.

Pointing out that female birds of prey are larger than males is also iffy at best, as T. rex is only distantly related to them, and there are many other bird species where the male is larger, or where there is no size difference between genders at all. Crocodilians are also distantly related to T. rex, and with them, the males are significantly larger than the females. A female saltwater crocodile that's 4 metres long is considered gigantic; a male saltwater crocodile that's 5 metres long is merely average.

[Stegotyranno420]

An extensive new paper on the tyrant king by Thomas Carr. Among many intriguing conclusions is that sexual dimorphism cannot be determined by skeletal structure, ergo Sue's gender remains unknown. Sue also regains their status as the oldest known T. rex, while the larger Scotty is found to have actually been one of the younger adult specimens.

https://peerj.com/articles/9192/#p-296

Does this mean Scotty might have grown even bigger had they lived longer?

The article is not opening for me.
SO do you mean geologically younger or maturity younger

[suspsy]

Younger in terms of maturity. It was previously thought that Scotty was even older than Sue, but this paper concludes that it was actually one of the youngest mature specimens.