You can verify your age on your Google Account with these steps:
How to verify your birthday on YouTube and Google
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- Sign in to your Google Account privacy page.
- Click Personal info.
- Click Birthday.
- Verify or update as needed.
- Click Save.
If you're using m.youtube.com, you may need to sign out and then sign back in after you have verified your age. Learn more about age requirements on Google's accounts.