Help Sexing My Two Madagascar Giant Day Geckos!

[Lilherp25]

Hey Everyone! This is my first time posting to the forum. I live in South Florida and I recently obtained a wild caught duo of Phelsuma Madagascariensis from the wild invasive population found in the southern Florida Keys. A friend of mine had collected them from their back yard down there. Since they are wild caught, I have no idea what their exact age is. Their lengths are very similar, just over 6 inches nose tip to the end of the tail. I'll attach photos of the two geckos below. One came to me with his tail broken off. The first two pics are of him, the second two are the other with a full tail.


Any guesses on what their genders are? are they even old enough to tell? any help is appreciated!

 

[Lilherp25]

Also does the gecko with the missing tail, does he appear to be a bit thin in the images in my original post? Ive never witnessed any aggression. When I put food in the enclosure, he isn't excited like the other gecko is. rather he just remains in his place on the glass. Im worries about him! I haven't witnessed him eating yet when I first put food in.