I just had my first family transfer. The family had 4 children with the youngest 6 year old adoptee.
From other threads, I anticipated that the 6 year-old would be an adult, but not the eldest adult.
The children in order of birth were A, B, C, D. At the time of selection their ages (oldest to youngest) put them at: D - 27, B - 26, A - 25, C-24.
They were not a year apart in age when they were children (didn't think that was even possible).