[21M] Am I starting to bald or it's a maturing hairline?

[ss788]

My dad and granddad are bald. My other granddad has very thick hair at 60 if that even matter...

Till now I have not noticed any hair loss. In fact I will say my hair is thick and grows fairly quickly. But was looking at the mirror one fine day and noticed my hairline is receding (or maturing?..) and since then i have been pulling my hair every few hours as a litmus test for the first indication when i start shredding hair...

Here's some pictures of my hair (I was born with two hair crowns which are close to each other):






This is me 2+ years ago (i have slightly higher temples, according to my hair stylist):