It really is a bit heartwarming to see the elderly warming up to Bitcoin and the modern world.
That is a granny that is still very much young at heart because I cannot even imagine my granny being accommodating to any other payment method asides physical cash that she can see. She is not even interested in bank transfers because of the stress she may have to go through to get her money. I feel in the future, there will lot more elderly people who will accept payments in bitcoin, by then, we will become the old people of that time and it will no longer be surprising to have older people using bitcoins for payment.
I think those will be the grandchildren's recommendations 
Yea, her grandchild took the photo while the other grandchildren were aside watching. Now, it's time to go home and stop stressing granny