My car's tires are 3+ years old and the front is like in image. There are some cracks between the treads on the front tires.
It is quite similar to what's been posted here: Do these tyre cracks necessitate replacement?
Anyway, please let me have your opinion.
Should I replace the tires soon?
Thanks.
Yes, please get new ones.
Especially the sidewalls are rather thin. So those deeper scratches on the sides are a little bit worrying.
Overall, those cracks on the surface show that the rubber has hardened. You will not have the best grip, which affects not only turning ability but more importantly brake distance and can also cause you to spin off course far more easily.
