Aadhaar card: For how many days does the Aadhar card remain valid?

Many times people ask many questions related to the validity of the Aadhar Card. 

You should be aware that the Aadhaar card remains valid till...

As long as the Aadhar card holder remains alive.

After that, you can lock that person's Aadhar card.

So that no one can misuse his Aadhar card anywhere.