depends on what you are looking for.

Drinking is 18 years for alcohol under 22%,

And 20 years for alcohol over 22%.

So it is not much a 16 year old person can do at night time in Oslo.

There is no minium age for drinking alcohol (in private). The minimun age for buying alcohol is 17 years old for wine and beer and 18 for spirits.

The legal nationwide drinking age in Australia is 18.

There is no age for legally drinking alcohol, but there is one for buying it: 16 years. It is however almost nowhere enforced.