You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is All of the following joints ossify 16 years of age except and explain in detail?
Milking Position, to remember age of ossification of skeletal maturity.

Joints facing toward sky like shoulder, wrist and knee ossify around 18 years.
Joints facing towards ground like hip, ankle and elbow ossify around 16 years.