Re: What's the age a child should learn the Quran
My kids go to an Islamic program at the masjid where they learn Arabic for the Qur'an with tajweed, hadeeth, akhlaq, seerah, taleem ul haq, etc. 3 times a week after school. Personally I find this very beneficial as the association with other kids their age brings in a healthy competition and creates an environment of excitement towards learning.
The downside is that the progress is slower compared to one on one at home lessons for sure, but who's in a hurry? I feel a good foundation is better than just getting over the formality of learning. The positives, I have already mentioned above.
The best age to start would be when a child can speak clearly and can follow instruction, perhaps 4-5 years of age. It could take anywhere from 2-4 years depending on the program and your child's consistency.