A few years back there was scheme that KK introduced. It allowed a concession for older persons (incl pensioners) to scale back their home size (downsize) and get a concession.
Of course the standard first home exemption or even a grant may apply to a elderly person acquiring a first home....We see a bit of this as we deal with retirees and super and aged care. And some acquire their first home very late in life. It should never be assumed that a older person has always owned a home.