Drinking age is 16 here but on the other hand, driving is 18. So once you start working on your driving license you will already know the effects from drinking. In the US you can already drive with 16 but you aren't legally allowed to drink, so once you are allowed to drink you won't really know how it feels like to be drunk or anything similiar.
The drinking age is actually 16 for <10% alcoholic drinks so the best you can get is like a beer or some sort of weird mixed stuff. Once you are 18 you can buy all alcoholic drinks. I think it is fine how it is here in The Netherlands but yeah, you can't really compare it with the US/Australia.
Getting your driving license is much harder when you compare it to other country's. There are 17 million people living in a very small country. Loads of roads, cycling people, weird rules, etc. on the other hand in the US/Australia you just have extremely long roads where close to nothing can happen. Anyways, this is more about the drinking age.
I would say 18.