When does mandible stop growing and how to maximise growth

[mrman]

I'm 19 and look pretty good but my chin looks like a pussy compared to the rest of my face, doesn't have that strong square chin look. Can I still expect any growth and what can I do to maximise this.

 

[Enlil]

its over, stops at 18-16 for males but you can mew and apllying pressure on palate (suckin ur tongue ) may trigger some saggital growth