Generally speaking, 18 years old can do micro plastic surgery. What's wrong with the nose? If the tip of the nose is not upturned, you can use your own ear cartilage as the tip of the nose, which is very effective.

If the bridge of the nose collapses, you can consider injection filling or prosthetic rhinoplasty.

If the tip of the alar is large and trumpet-shaped, consider reducing the alar.