Also life span was much shorter, productive years of life were much lesser and there was little incentive to spend time in things such as "learning". It made se

Also life span was much shorter, productive years of life were much lesser and there was little incentive to spend time in things such as "learning". It made sense to prepare children of life's hard work right from the beginning. Just the way we currently burden little ones with learning alphabets, basic numbers and memorizing math tables. We don't see these things as burden today but may be 100 years later when human beings will have to work very little to achieve a lot some of the people would look back at future and say our ancestors forced their little Children to learn thing like math tables only to make them slaves at some corporate office.