That tortoise is a male. If you hold the tortoise head up against your chest and let someone take a picture you will normally get a much better shot of the tail. On their back and especially touching the tail, they will pull it in defensively making it look smaller. The "V" shape anals will start to thicken and point more outward as it matures. The gular scutes should already be elongating, but you don't show that in any of the pictures. It does look like its starting to get the concavity to the plastron, but that will accelerate and get much more pronounced it there is access to a female and repetitive mounting.