Comment by learc83

Children in New Zealand who began learning to read at age 7 had better reading comprehension than those that started at age 5 by the time they were 10.

http://www.sciencedirect.com/science/article/pii/S0885200612...

Children in Germany who started school at age 7 performed better on standardized tests than those who started at age 6.

http://ftp.iza.org/dp1827.pdf