Lumbar vertebral column
There are 5 groups in the vertebral column. In order they are called 1) Cervical 2) Thoracic 3) Lumbar 4) Sacrum 5) Coccyx The 4th group contain 5 bones and once you are in the adult phase, roughly at about 26 years, the 5 bones fuses into one bone which shrink the number of bones the vertebra column have but but does not lose in size.
The mother and child share a special bond that starts while the baby is in utereo. The mother and child ideally continue with a relationship that no one can break due to the bond that was formed before birth.
You are probably asking about the sacrum, which is 6 bones that fuse together as a child matures. This is not an arthropoidal joint like the knee or elbow that rotates around. There are strips of super-slick tissue on the hip bone that allow the sacrum to shift slightly. These can become damaged or worn, and cause considerable pain.
SJPerelman's column in the Saturday Evening Post was called "Dawn Ginsbergh's Revenge."
Normally when the child is 18, or starts work.
Mild
Beyoncé was the one who started destiny's child and she was about 4 years old.
Excellent .
not until 18
It depends on the age of the parents. If a woman is 15 when she has a child she would be a young adult at 20 when the child starts school. On the other hand if she was 40 when the child is born she would be 45 years old when the child starts school and be in post menopause.
Jared
Child of Krakatoa