Please Help Identify If This Is Early male pattern baldness Or Not

[SuperLuigi]

Hi, please could someone tell me if this is early signs of male pattern baldness, or just a natural hairline. I have a very thick head of hair and it grows very fast, no signs of shedding, so for all I know this hair line at the crown could have always been there.

But I would really appreciate it if someone could confirm if it looks like it could be natural or if it is definitely male pattern baldness... in which case, how long until it becomes very visible?

 

[Mandar kumthekar]

Could you post a frontal hairline photo? Then may be I can tell you.