You may have age limits for:
- watching movies
- accessing specific internet sites
- enrolling a course
- drinking alcohol
and so on. The actual ages depend on the details of the country/region.
These limits are not exactly for children, but mostly for teenagers.
What are the age limits for those examples in your country?
By the way, since you are talking about age, there is not a specific consensual age to define the toddler/child/teenager/adult limits. I mean, up to which age would you consider a human being as a child?