I believe he is much older than 4 months. That is a lot of pyramiding to just happen in 4 months. I would agree with Yvonne, his age should be measured in years.
Yes. smooth and small is how i can tell Dawns pic above is a baby. It takes some time to achieve any tyoe of pyramiding
whateverNot true. Pyramiding can happen at any point. This entire thread alone is about a 4 week old who is pyramided and there are other threads on it as well.
http://www.tortoiseforum.org/threads/pyramiding-in-sulcata-hatchling.43597/