The Simulator 'Chance of survival' bar shows the likelihood of reaching selected ages based on your age and sex, and on the balance chart the age your super runs out includes the chance you will live to that age. These numbers are calculated based on mortality tables prepared after each census. Alongside the mortality rates are rates of mortality improvement. At most ages the mortality rates are improving (reducing) by up to 2% p.a., so that the rate of death for a 60 year old in 20 years is forecast to be perhaps 20% less than it is today.
Both the Australian and NZ governments have released new tables in recent years, and we have just loaded these tables into the Simulator.