How long is it responsible to wait until a couple gets engaged/married?

After how long do people normally get engaged and married? I think 6 months is too short and 10 years is too long to wait. And as I am under 21, what age should I wait until? As a side note i have been dating my bf for three years. I know I am not ready yet but I just want to know what the norms for marriage... show more After how long do people normally get engaged and married? I think 6 months is too short and 10 years is too long to wait. And as I am under 21, what age should I wait until?

As a side note i have been dating my bf for three years.
I know I am not ready yet but I just want to know what the norms for marriage are.. anyone?
Update: okay it is NOT a highschool relationship
i met him after highschool and he is five years older than me
i am still an adult and incredibly mature even if I have not reached 21 years old yet
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