At the MCK website it states his age on death as 77.
Name Died Buried Aged Cemetery Comp. Row Grave
ISRAEL SEGAL 25 Jan 1968 24 Teveth 5728 26 Jan 1968 77 FAWKNER CEMETERY JEWISH ROW 09 665
In the Jewish News article about his trip to Israel it states he was 18 when he arrived in Australia in 1911