What a lot of people don’t understand is a “maturing hairline” is male pattern baldness. Your follicles are getting affected by DHT and as a result falling out. For some lucky people they maintain NW2/NW3 for the rest of their lives, for others it progresses slowly and for the unlucky few within the space of 1-2 years it’s all gone.
That aside your hair looks fine, just keep an eye on it and take photos every couple of months. Also when taking photos try to take better ones e.g hair pulled back, temple photos, crow photo etc.
Goodluck