How much cartilage do humans?

Humans are born with approximately 80% of their skeleton made of cartilage, which gradually transforms into bone as they grow. By adulthood, the amount of cartilage in the body decreases significantly, with only a few areas retaining cartilage, such as the joints, nose, and ears. In total, an adult human has about 15% of their original cartilage remaining, primarily in the form of articular cartilage that cushions joints.