That's 1,000,000% male, no doubt about it. Someone looked at this exact animal this week and told you it was female? They're obviously incompetent. He has an extremely obvious hemipenal bulge (his man-parts, at the base of the tail) and the colors scream male. He looks to be around 6 months old, give or take, and should get more colorful in the coming months.
Whew, thank goodness. I was so worried it was a girl. It's my first chameleon..first reptile actually and I don't know how I would handle a girl and eggs/egg problems.