Australian immigrants 163 category

At the beginning of obtaining a temporary residence permit, children can follow their parents to obtain a temporary residence permit as long as they are unmarried below 2 1.

When the conditions are met, when applying for permanent residence (that is, green card), no matter how old the child is, as long as he is unmarried, even if he is over 2 1 year old, he can get a green card with his parents. But if the child is married and single during this period, you can't get a green card with your parents. You have to take care of yourself.