In Netherlands it's better for you if you are older than 30 because your salary requirements imposed by the government are much higher(4.404 euros per month) than those for under 30 y.o. guys(3.229 euros per month).

So it's actually worse, right? Having to find a job that pays much more is actually more difficult, isn't it?

I can only tell from my experience - I(35 y.o.) had 3 interviews in NL, 2 offers and took the one that had the highest wage that is even greater than required minimum..Also, I believe that it's pretty easy to find a developer job in NL because it seems that the country lacks IT professionals..

Dude, all offers are greater than the minimum. Doesn't make sense to offer otherwise.