They are different ages, but age doesn't matter. Westerners value individuality and freedom and, therefore, are more horizontal in their relationships. You need a more vertical attitude in order to understand True Children. They were born into True Parents' direct lineage. Because of this, they suffered a lot.
True Children have the right to the Kingdom of Heaven, but they live in the fallen world.
They don't even know why they get angry at unrighteousness. Their understanding of True Parents is so deep. They know them automatically. True Children experience a very difficult childhood until they are able to understand Father's worldwide mission. True Parents never spent time with them, but rather spent time with members.