18 in Finland for voting, driver's license, buying beer, tobacco & such. I think you're legally pretty much hold accountable for everything you do past 15 years, but not quite anyways. So basically you reach the milestone for everything when you're 18. Except stronger alcoholic beverages: 22 % is the maximum limit for 18-19 olds, at 20 you can buy the stronger beverages. Legally you can drink under parents eye's at younger ages as well, I think, but basically most young people begin drinking (outside home) at 13-15. 16 is the age when you can fuck legally. And at 15 you can get a license for a moped/scooter/tractor/and such (like the most awful things ever to be met on roads: moped fucking cars), at 16 for light motorcycles.
I'm 23 so I don't really have anything to look forward to in that sense.
And I think everyone should be held (almost-if-not-fully) accountable after being about 12 year olds. I remember wondering, at that time, how I already knew perfectly well what was legal & right, but still couldn't be punished for doing something wrong. At least 15-year-olds should be fully accountable. At that age you should now, perfectly well.