Doris Hancock, 95, is walking the length of Hadrian's Wall to raise money for the charity Centrepoint.
The fundraiser, from Ambleside, received a special early birthday message from the charity's patron Prince William, to wish her well as she reached the halfway point.
Marti Errington-Dodds caught Doris as she reached her checkpoint, met with applause and a slice of cake.
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The 100th anniversary of Britain's worst rail disaster will be commemorated at a special service today.