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Does the donor want it to continue now?
The laws and forms have changed and so it is much better for the donor to do a new one now, while the donor is still competent.
At some point in time it will be rejected by more and more financial institutions.
It does not expire but if an institution won't accept it then you are going to be in trouble and over time they stop accepting older forms. As the last thing you want is to have to go to court for an issue that may arise (the POA is to avoid that of course) it just doesn't make sense not to update it if you are being asked.
Here is a link to a template that may work just fine for you:
It is put out by the government so it is reliable.