Aadhar card is to be linked to PAN. But aadhar is not required by NRI as per aadhar act. What to do in this case.

My aunt (smt P Nirmala Bai) is bed-ridden; her Aadhar card is not having full information with Ref to date of Birth (having only year no date and month) without full date of Birth, PAN card application not accepted. No PAN card since bed-ridden, going to Aadhar center ruled out. how to file IT return without PAN card?

My demat account was old when I was in India, now I am a US citizen. I have few stocks/shares in my demat account and investment in mutual funds. I am not entitled to have an AADHAR card being US national. My question is after March 2022 if I do not link my PAN with Aadhar then my PAN becomes invalid. Please tell me what to do.