I can understand why the voice chat caught you off guard - Gorilla Tag's social environment can be intense even for older kids. It's worth knowing, though, that Meta has strict age rules for Quest accounts. Even with a parent‑managed setup, the youngest allowed users are 10–12 years old. A 7‑year‑old is below the minimum age the platform is designed or legally permitted to support.
Because of that, if a child uses a regular 13+ account, Meta treats it as a teen account and enables features like open voice chat by default. There's also an important risk to be aware of: if Meta detects that an account holder is under the required age, they will suspend the account, and any purchased apps tied to it can be lost permanently.
If you want to keep using the headset, the safest approach is to make sure the account type matches Meta's age requirements so you can use the proper parental controls. But it may also be worth considering whether waiting until he's old enough for a supported account will give him a safer and more appropriate experience overall.