legally drinking alcohol since 16, had my wild years until 20 and since then started to enjoy it rather than just getting drunk.
The problem with the dringing age is that no matter what age you choose - at a certain point (imho around 15-16) kids will get curious and they will get their hands on alcohol.
If they are doing it "illegally" they always will be out of control. If they are doing it "legally" you
can have a bit more control.
When I started drinking beer with 16 in the beginning it was mostly with my parents and family at family birthdays or holidays etc. My uncles and older cousins had their fun watching me getting drunk but they also kept an eye on me. Of course I went drinking with my friends as well, but then I already knew my limits .. which doesn't mean that I stuck within them, but I already knew the experience