starting formal school after 5 years old is developmentally appropriate for most children. However, earlier exposure to a fun, play-based learning environment (like preschool) is also beneficial.
Most countries begin formal schooling for children at age 5 or 6. For example:
United States, UK, Canada, Australia: Typically start kindergarten at age 5.
India: Formal schooling often starts at age 6 (after preschool or "nursery" and "LKG/UKG").
Finland: Children start school at age 7, and their early education emphasizes play and social development.