Will an adult iguana get along with a younger iguana?

I have an older iguana who is about 15 years old, he walks around in our backyard and gets along perfectly with our 2 dogs. Well, im trying to introduce him to my younger iguana, shes about 4 years old and is a female. They are seperated by a gl door right now but the male older iguana is bobbing his head at her and she pays no attention to him at all. Would he hurt her or is it possible that he would get used to her? Any advice would be great, thanks!!!