The age of adulthood and consent are clear in the Bible. It is the age of 20. The age of consent in the Bible is 20. Israel did not follow what the rest of the world did, but followed what God told them to do thus separating them from the rest of the world. You can find the age of adulthood and consent in Numbers 14: 26 - 35 - Leviticus 27: 4 - 7 Exodus 30: 14. Mary had to be 20 or older to be married as anyone under that age was considered a child and called a little one by God.
'You shall not do what is done in the land of Egypt where you lived, nor are you to do what is done in the land of Canaan
where I am bringing you; you shall not walk in their statutes.
'Moreover, you shall not follow the customs of the nation which I will drive out before you, for they did all these things,
and therefore I have abhorred them.
beware that you are not ensnared to follow them, after they are destroyed before you, and that you do not inquire after
their gods, saying, 'How do these nations serve their gods, that I also may do likewise?'
Deut 1: 39 Moreover, your little ones, who you said would be taken as booty, and your children who don’t yet know good from bad — they will go in there; I will give it to them, and they will have possession of it.
Numbers 14:29 your carcasses will fall in this desert! Every single one of you who were included in the census over the age of twenty, you who have complained against me,
Numbers 14: 31 But your little ones, who you said would be taken as booty — them I will bring in. They will know the land you have rejected.
Exodus 30:14 Everyone over twenty years of age who is subject to the census is to give this offering to Adonai
Leviticus 27: 4 if a woman, thirty shekels. 5 If it is a child five to twenty years old, assign a value of twenty shekels for a boy and ten for a girl;