Because you can't live with out them not being married to you.
Will you marry me?
You have to be 18 to legally marry someone in the UK.
Will you marry me?
no did not get married
to marry someone older than you
no
You cannot marry someone who is already married, someone who is closely related to you by blood or (in some jurisdictions) someone who is of the same gender as you.
NO ONE WOULD EVER MARRY SOMEONE LIKE YOU!!!!!!!!!!!!!!!!!!
Nope
You are not allowed to marry until you can spell it.
If you are just living with someone (common law) and you want to marry someone else then you can legally marry the other person.
you cant