Referencing the last published Department of Statistics report on Household Spendings by Age Group, the average monthly household spending of those aged 50-59 was $4,837 (or $58,044 annually), and drops to $3,586 (or $43,032 annually) for those aged 60 and above.
But these were based on 2012-13 survey data. If we compound these with an estimated annual inflation of 1.5% (inflation has been low in recent years) for 6 years (from 2013 to 2019), the corresponding figures would be $63,468 (aged 50-59) and $47,053 (aged 60+) respectively.
Summary of data points:
For an annual spend