Patricia Peirson, a 90-year-old great-grandmother of five, was one of 87 men and 87 women who received Maundy money from the Queen at a service in Oxford.
She said: "I was amazed to be nominated. I never would have aspired to something like this. I'm very pleased.
"I'm going to save the money and give it to my great-grandchildren."
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Around 850,000 people in the UK have a form of dementia.
Gordonstoun School in Moray, which was attended by the Duke of Edinburgh and the Prince of Wales, is hosting a three-day event.
According to publicly available data, up to 210,000 Three customers are paying a loyalty penalty of £10 to £13 a month, the charity said.