We are planning on adding Parental Controls to Rocket League in the future. If you would like to more broadly restrict access to some features right now, you can do that with your platform at Epic Games Store, Windows 10, Playstation 4, Xbox One, and Nintendo Switch.

Epic Games Store
Epic Games Store has general Parental Control options, playtime and purchasing options. For more information see the following Epic Games Store articles:
How do I set up Parental Controls for the Epic Games Store?
How do I set limits for my child’s playtime or purchasing?

Windows 10
With the controls Windows 10 provides, you can set restrictions on activities including purchasing, playtime, access to content, broadcasting, and more.

For more information please visit:
https://account.microsoft.com/family/

PlayStation 4 (PS4)
PS4 settings include controls over spending limits, social features, and access to games, content, and the internet.

For more information please visit:
https://support.playstation.com/s/article/PS4-Parental-Controls

Xbox One
Microsoft’s Xbox controls include restrictions on purchasing, broadcasting gameplay, and access to social features including communication and multiplayer modes. 

For more information please visit:
https://support.microsoft.com/en-us/help/4482922/xbox-one-online-safety-and-privacy-settings-for-parents-and-kids

Nintendo Switch
Nintendo offers controls over features including purchasing, play time management, content viewing and sharing, and communication.

For more information please visit:
https://www.nintendo.com/switch/family-fun/parental-controls/