When does the mature hairline become balding?

At what point do you know that it has receded beyond a mature hairline? And by asymmetrical, do you mean that the forelock can remain in the juvenile spot while the temples mature faster?

I’ve been told by a professional I am not balding but I still remain super anxious about it. Though I do have anxiety disorders which probably relate

You have to manage your anxiety. Yes, you clearly understand what is happening. If you think it is going beyond a mature hairline, you can see a doctor or even send me photos, but wait at least a year. Connect with me at info@newhair.com