We study Latin in our home. I expect all my children to complete four years of formal high school level curriculum. I expect them to achieve the level of translation of classic Latin literature. I do not begin teaching Latin until age 10 because I want them to understand what they are doing and not merely parrot chants. I’ve met many children who “know Latin” but this means they can sing-song declensions; if you ask them what they are doing or give them a sentence, they are bewildered.
We do this for many reasons:
Developing logical facility
Developing vocabulary
Deepening understanding of grammar
Learning elegance in language expression
Creating an orderly mind
Expanding memory capabilities
Base for learning other languages
Teaching attention to detail
Learning exactness and excellence
And lastly, better performance on standardized tests necessary here for higher education.
I know you said you didn’t want an article, but I think a MUST READ on this topic is Climbing Parnassus by Tracy Lee Simmons.