Yes, I would say that your hairline is almost definitely receding. You can see tiny hairs all over your hairline. This is where your hairline used to be. It is hard to judge merely by looking at photos, but I would expect some further receding since parts of your present hairline do seem to be a bit thinner. Then again, take my word with a grain of salt. All of the posts you see in these forums are only opinions. No one can judge better than you or a decent doctor who can actually examine your situation.
All that being said, in my opinion you have great hair. It isn't very likely that you have caught an aggressive male pattern baldness gene. If I were in your position, I would probably start taking 0,25-0,5 mg finasteride daily. Perhaps later, if the receeding continues, I'd also add minoxidil to the regimen. 0,25-0,5 ml twice a day would be enough. I myself use minoxidil only in the evenings, around 0,25ml around the hairline.
Should you start doing something? If your hair means something to you, yes! It is always better to be proactive. Once the damage is done to hair, it is very difficult to reverse it. Hair loss drugs generally do not do wonders. However, there is one thing you have to keep in mind - treating hair loss is life-long commitment, or at least as long as you want to keep your hair.
