Balding or Mature hairline (Photo)

This requires an in-person evaluation. I suggest seeing a hair loss expert now to evaluate and go over your condition and provide you information about your best treatment options. There are great non-invasive options like prp/progesterone and/or Hair transplantation. See an expert. Best, Dr. Emer

As men mature often their juvenile hairline may recede a little bit. From the picture your hairline appears appropriate for the male aesthetic, however this is best determined by personal preference and a professional evaluation to find whether or not miniaturization exists. If so, perhaps early intervention with medical therapy may be the appropriate course of action.  

That is not a hair loss because of ongoing process of androgenetic alopecia but  your natural frontal hair line or maturing of frontal hair line.  That is seen almost every young boys almost between 16-21 that have a very rounded hairline without recession in the corners.  Recession in the corners is a sign of mature pattern male frontal hair line.