Well In My Thnking 4-5 yrs.
I think 4 year is right age.
3 year nursry and 5-6 is right time to start..bcz slybs made thrw by age....mantl abality
Now-a-days, Many of the parents are joining their children at pre-school. It will be a basic step for their kids for learning. Mostly 3 or 4 years is the right age for pre-school.Best preschool franchise in India