Sometimes males will get color as early as 2 months. Like Chams4life stated, sometimes there is late bloomers. One of my hatchlings last year was a late bloomer himself but by that age, USUALLY, there is some trace of color.When is the correct age abouts where the most crest protrusion can also be a good indicator? I'm probably assuming the chameleon would be showing adult coloring by then though?
Lol you notice I avoided this thread due to my lack of panther sexing ability. I defer and bow down to all the Panther keepers here. But here is the link on lay box info that I refer everyone too https://www.chameleonforums.com/blogs/egg-laying-and-the-laying-bin.345/