Hi James from Canada
NSW bdm lookups are available free online
http://www.bdm.nsw.gov.au/familyHistory/search.htmI checked your folks and found
1007/1904 GALBRAITH RICHARD D 67 YRS CONDOBOLIN CONDOBOLIN
The indexes don't usually show age at death but when the parents names are unknown on the records, the age often appears. This marriage is online
2006/1872 GALBRAITH RICHARD D HAXALL SARAH DENILIQUIN but whether it is yours?
There are three deaths for Thomas Galbraith between 1892 and 1907. (and two marriages) 1856 and 1871
If you want to get information from any of the certificates the cheapest method is via a transcription service. Australian death certificates often show length of time in Oz, giving approx date of immigration. Given that the parents are "unknown" on these certificates, this information may also not be provided??
http://www.bdm.nsw.gov.au/familyHistory/howToSearch.htmHope this helps
Trish