A book about the Jarrow March that I bought today mentions that the oldest man who took part in the March was "Geordie Smith, 62, and a veteran of the Boer War."
books.google.co.uk/books?id=IsJkDQAAQBAJ...20boer%20war&f=false
There were two Smiths who officially took part in the march - George Smith, of Simpson Hostel, and Ralph Smith, of 28 High Street, both Jarrow addresses. 'Geordie' is surely likely to be George?
groups.google.com/forum/#!topic/uk.local.geordie/LaQp9cFTizk
Geordie will appear somewhere in the photographs and film footage that were taken of the marchers.
Edit - Further on in the book, it does name George Smith as being aged 62.