How to update audience setting for your YouTube videos
As a YouTube creator, you are required to set your audience, i.e. made for kids or not. Both YouTube Studio and the main app provides audience settings to assist with compliance. You can set your audience at the video level, where you will define each individual video as made for kids or not. Here's how you can do it.
Performing the action in YouTube Studio
Open the YouTube Studio app and tap on "Content" in the bottom menu. Choose the video you want to edit > "Edit" > "Audience," then choose "Yes, it's made for kids" or "No, it's not made for kids" and press "Save." You should designate specific videos as made for kids only if certain videos are intended for a young audience.
Setting audience on main app
Open the YouTube app, tap your profile picture, and select "Your videos." Next to the video you want to edit, tap "More" and then "Edit." Tap "Select audience" and select either "Yes, it's made for kids" or "No, it's not made for kids" to define your audience. From the same menu, you can also set "Age restrictions" for viewers under 18.