It’s part of what drove me out of the country in my thirties when I still looked like I was barely 20, at most, but was already considered too old on paper. Age discrimination is illegal in the Netherlands, but it’s still considered perfectly permissable to require someone’s DOB for a job application.
When I was in the US in the 1990s, I learned that your DOB and marital status had no place on your CV because they have nothing to do with your suitability for a job. The Dutch were later appalled to find that I had adopted that habit. Thirty years have passed, and little has changed in that respect.
Your way around such biases? Also racism etc? Be your own boss! If you are worth your salt, you can do it. Move abroad if you have to. Go where you are appreciated. Don’t stay where you may be merely tolerated either. You deserve better.