Google recommends that you use Family Link to set limits for your child.
Excerpt from FAQ: Family Link can be used to supervise teenagers (children over the age of 13 or applicable age of consent in your country). Unlike children under the age of consent, teenagers have the ability to stop supervision at any time, but if they do you will be notified and their devices will be temporarily locked and unusable.
*NOTE: There are many articles that discussing bypassing Family Link. It is important to configure your home router in addition to Family Link.