When is a boy considered a man?

Q: When does a Boy become a man? 

A: 18-21

I lean towards the latter. 

Read Exodus 30:12-14; Leviticus 27:2-5; Numbers 1:2-3. There is no justification for a lower age. Sometimes people suggest 12 (Luke 2:42), but in Mark 5:41-42 the 12-year-old is called "little girl".

This also explains why in USA a lot of things are not legalized till age 21. 

Side note: Men also do not have a fully developed brain until between 35 and 40, which could be why most men do not marry until that age. For a women its around 25. 

This also explains why no child in college today is capable of making well informed decisions, and don't use critical thinking or understand logic. Neither do children or teens (in the cesspool of today's public school systems). 

Further look into this in regards to this topic

Related to the topic of women teaching, it is always the best practice for men to be the teachers at home and in the church, the problem is there's few men in church and fewer actually growing in the knowledge of Scripture & its doctrines to become teachers. So, like Deborah, women step up to instill godly principles in educating them, and share the Gospel. Men need to get their act together & mature in the faith to do the work in the church and be spiritual leaders at home; rightly equipped for that responsibility.  

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Rabbit trail