Welcome Kavyaan Sharma,
Thank you for providing the details. Since your existing Copilot conversations still open normally on your Android device, that suggests the chats themselves are still associated with your account.
To narrow this down, could you please confirm:
- Are you accessing Copilot on the PC through a web browser (copilot.microsoft.com) or through the Copilot app?
- When you sign in on the PC, does Copilot show the same account information/profile picture as the Android app?
- Approximately when did the age-group message first appear? Was it immediately after the recent Copilot update?
In the meantime, please try these quick checks:
- Open an InPrivate/Incognito window and sign in to Copilot again.
- If using a browser, try a different browser (for example, Edge and Chrome) and see whether the same message appears.
- Visit your Microsoft account profile and verify that your birth date is correct: Microsoft Account
- Sign out of Copilot on the PC completely, close the browser/app, then sign back in.
I look forward to your update.