Hi Michael, You need to be cautious of any record of stated age, age, as it was quite common to state what was required at the time. Your best bet is to look at their death certificates. I suspect that the Australian version, like the NZ one will state the place of birth of the deceased person, as well as the names of their parents, (if known by the informant.) Likewise for Sarah and William, look at their marriage certificates, then subsequent births of their children, as these may also state their place of birth. This is the only true way to work back in time, rather than looking for a likely candidate in the IGI or similar. Good luck! Carolyn in NZ