Do I have a mature hairline or is it male pattern baldness that I should be concerned about? (Photo)

I’m a 26 year old male and my hairline currently looks pushed back around the temples. I’ve looked back at early photos of me even as far back as 14 years old (see attached) and my hairline already seemed like it was M shaped. Does this mean my current hairline is more likely due to my hair maturing as I get older or is it a sign of more substantial MPB that will be more aggressive.