Started my eldest from the age of 2.5 years old and no regrets. Her communication skills grew exponentially and she's no longer timid. Since she extends her stay after for daycare, she mixes with kids double her age and is able to hold a proper conversation. The worst thing we can do for our kids is keep them trapped at home in isolation and not go out and experience what we used to do as kids which is to mingle and play with other children.