There is no way to tell age from size with these guys but it really does not matter all that much with them. if it were a great eater from hatch it could be a 3 month old. If it did not get such a great start it could be a 9 month old. For reference, I have a 2016 hatchling that was a super hard start. I kept her because of this. Finally she is eating consistently but she is still in a 28 quart tub, barely, and weighs in at 250 grams. 6 months ago she was looking like a large 2017 hatchling.
I apologize but this is most certainly a spider but that is all I see. She is a spotty one but certainly a spider. Try posting photos in better light especially highlighting the head and sides of the animal.