John Ross was final seen leaving an aged care facility on Chiswick Highway in Greenacre about 1.30pm on Saturday and nonetheless hasn't been discovered regardless of a number of police appeals for assist.
"Police and household maintain severe considerations for his welfare as he lives with a cognitive impairment and different medical circumstances," police stated in an announcement.
READ MORE: US mass taking pictures a 'hate assault'
They described Ross as Caucasian in look and about 175 centimetres tall, skinny, with white hair, white beard and glasses.
He was carrying gray tracksuit pants and a light-coloured cardigan when he was final seen and stated to frequent Bankstown, Greenacre and Randwick.
Bankstown police looking for the person have despatched out a geo-targeted textual content message within the space.