Age of a minor?

Are you considered a minor till your 16 or 18?

18 for the US

It depends on where you live, but you are considered a minor until you are either 18 or 21 in certain circumstances in the US.

Depends, a minor to do what?
If it is something sexual then you are legally a minor at 17 and under.

the age of consent is 16 the age where you can be changed as an adult is 18 and the age you can drink at is 21

Most states, the 'age of majority' is 18.

18, I think it's everywhere.

It depends on what exactly you're talking about,
age of consent (for sex) varies from 16-18 depending on state
legal drinking age is 21 wherever you are
18 is technically where you are no longer a minor, although in some states it is 18 or when you graduate (something like that)

In some states it depends also in if you are male or female.