From the photos you have posted, Kitty (lutino budgie) does look like a young female to me.
Your Rocky is a male and he looks younger to me. In some cases, young budgies can start to develop their irises sooner.
Rocky has a thick baby barring all the way to the cere, he also hasn't yet moulted his baby throat spots or cheek patches, not to mention he still has the immature colour on the cere.
If he were 6 months, the cere would have started to mature into the royal blue colour.
From the pics, I would say he is 4 months old.
My Leonel is also a dominant pied budgie and his irises started to lighten at 4 months of age. By the time he was 6 months old he had fully developed white irises.
I couldn't help to notice that you have a half coconut toy serving as a nest and nesting material on the cage. Please remove these items from the cage because they are not needed and follow the recommendations on this link: https://talkbudgies.com/budgie-breedi...want-eggs.html
Your budgies are much too young to breed and by having a nesting area you will be encouraging breeding behaviour.
Before taking the breeding route and in order to do so more safely, a person should have a very good grasp of the species (this comes with real life experience in budgie ownership) and to do the required research into the subject.
The decision to breed comes with a whole lot of responsibility and commitment, the lives of the breeding pair(s) and the chicks are depending on you and the response you give if/when faced with adversity.
Things like being able to tell if your breeding pair is in good health and top physical condition to go through breeding; when a hen is expecting an egg or if she is showing the first signs of being egg bound; when a chick is having developmental problems, not being fed or showing signs of dehydration;
when there is aggression, abandonment and neglect of the chicks and it's solely up to you to feed and raise the chicks. The ability to detect early on and solve these issues can truly make a difference on the outcome of your breeding journey.
Please read this link: https://talkbudgies.com/budgie-breedi...s-new-old.html