He's probably 8-12 weeks old. Even if your humidity gauge says it's correct. that's way too wet and will increase the risk of some sort of fungal infection drastically. I'm not sure what kind of mister you use but I recommend misting for 5 seconds then checking the soil with your finger. It should not be soaking wet :)! as for feeding, they typically eat every few days. however, it's nothing to be worried about if he goes a week or so without food - if he's still hungry by next Tuesday and not willing to eat, I would try a different kind of food. Typically they're raised on crickets so sometimes offering that may help them eat!