Can parents and children of new immigrants not immigrate?

Investment immigrants are all applied by one person, and their spouses and children immigrate together, that is, one person applies and the whole family immigrates.

But there are restrictions on the age of children.

Australian immigrants: children cannot be over 23 years old.

American immigrants: children should not exceed 2 1 year.

Greece: Children cannot be over 24 years old.

Greek and Spanish immigrants can immigrate for four generations, that is, the principal applicant and the applicant's parents, the spouse and the spouse's parents and children.