If LINE cannot be used because age restrictions are applied (e.g. on your child's device), you can change the age restriction setting for apps. To do so, follow the steps below.
To change the age restriction setting:
1. On your device, tap Settings.
2. Tap Screen Time > Content & Privacy Restrictions.
3. Tap App Store, Media, Web, & Games > Apps.
4. Select the appropriate option (e.g. 12+)
Note: If you're asked for a Screen Time Passcode, please enter the passcode set on the device.
If you don't know the passcode you're asked to enter when changing the age restriction setting, please refer to the following Apple Support page.