Personally I think it is after getting to know a woman more who married when she was 16 and gave birth when she was 18.
Divorced at 20 and only enrolled in Uni / got employed part time at the age of 24.
She realies heavily on support from her family and told me personally her life's been a struggle, fair enough but I hate how she doesn't think it's partly her fault
(or maybe she knows it but she's too proud to admit it)
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You shouldn't make any big decisions like that until you're 21, at least. Even then, you should spend a year or so thinking about if that's really what you want. This isn't just for marriage/children either - I would recommend the same for leaving a job, applying for a job (in some cases), becoming religious, changing religion, becoming atheist, leaving the country, leaving the planet, joining the army, getting ordained, and becoming a supernatural entity.