peterb, I agree with you from my own experience of UK death certs (obviously not exhaustive!) since the start of Statutory Registration (1855 in Scotland, Sep 1837 in England) that old age ('Old Age' or 'Senectus' or 'Senile Decay' etc) for a 63 year-old would probably have been unusual - perhaps he suffered from what we would call early onset Alzheimer's? Or perhaps 'old age' was just a convenient excuse because the doctor didn't really know the cause! I don't mind seeing old age as a cause of death (as I have) for my Gggfather (died 1876 aged 78), or my Ggggaunt (died 1897 aged 86), or another cert I have (died 1869 aged 97) but I fear I'd be a bit suspicious if the cause of death for a 60-ish person were listed as old age. Though the following is admittedly anecdotal evidence, all the UK death certs I have of people in their 60s give quite specific causes of death e.g. tumours, apoplexy, chronic bronchitis, etc. And UKgirl, my experience would not support your comment that PeterB's "great-great-great grandfather lived to a GREAT old age". It would be interesting to see genealogical actuarial analyses based on known facts of life expectancies at birth, during childhood, in young adulthood, and then once middle age had been reached.
JAP