What's not "lost on me" is the fact that you have absolutely zero experience raising children yet are always first in line to advise every other parent how to raise theirs. I have three daughters and three sons who have never even remotely had a desire to get married at age 21, much less 16. Furthermore, with my experience raising six children, I have never felt the need or desire to tell other parents how to raise their children or what is the "acceptable" age of consent is. My advise to you would be to keep your inexperienced parental opinions to yourself!
Knowing your moral compass, I bet you would give your 16 year old pregnant daughter consent to abort your grandchild before you would give your consent to marry. Can you think of any parents you know that would do that?