Just had another thought. I have a photo of the Thomas /Mary grave at Andreas. I can scan it onto the pc upstairs - I'm on a tablet at the moment. However, it reads 'Mary Harrison wife of the above who died March 25th 1898 aged 78 years'. A birth in 1820 seems to answer your question !
Where can I send the scan of the photo ?
I only joined this mssg board yesterday so not sure how things work.
Best wishes, Joan Kennedy