Depending on who the informant was at the time of death can also make a diffference. An example from my own family tree is my great great grandfather. He was born in 1814, and died in 1871, aged 57 years. The informant was not a family member, and both the GRO death index and the death certificate has his age as 67. If he didn't have such an uncommon name, Joseph Nixey, it could have caused some problems locating his death index. Another thing to ponder on that happened in my own family is that the place of death and the place of burial don't always match. Two examples are my great great great uncles, John and Edward Nixey. John died in 1857 in Essex, Edward died in 1866 in London, but both burials took place in Slough, Buckinghamshire. Kind regards, Jon