Welcome to the forums!
Glad you're starting off at the right spot
Your cham looks to be hydrated. Eye's aren't sunken in and you can't see it's ribs which is a plus.
One thing i suggest is making sure your cham is well misted. Your cham looks like it's struggling with a shed. It's all brown/dark in the first pic probably because he/she is uncomfortable with its new environment/shed.
Hows your enclosure set up? Do you have a misting schedule? Vitamins? What are you feeding him/her and are you gutloading? What type of lights do you have?
To make things easier, fill out this
https://www.chameleonforums.com/how-ask-help-66/
Just copy/paste this with your info filled out in a new comment and we'll be gladly to go over your set up. From here we can make sure you're headed in a right direction.
I also question your chams sex because allot of the times sellers try and get new owners to buy females, making you think you bought a male which is common. Be sure to take some more pics of the chams rear-end. Pics from the vent (anus) to the tip of the tail will help members sex your cham. The first pic your got is perfect but he looks stressed out, so a better pic will help.
As for age, i'd roughly guess 2-3 months? It's hard to tell by the pics. Try to have him next to something to size him. Maybe him walking along a ruler's edge. BUT allow your cham to hang out and get used to their new environment for a good 2 weeks before you handle him/her. This will also help reduce stress.
Again welcome to the forums!
