S'pore has been ranked top 5 as the most expensive country in Asia. Key items which are the most expensive are private housing and cars. If one does not choose to own these, it is easier to have enough for retirement.

HDB regardless of BTO or resale are still highly affordable. To progress to retirement, one would likely have bought at least a HDB (regardless of size). It is important to have a roof. Then comes your calculation of how much you need per year on food, clothing, leisure, support to elders/children. From there project the number of years and escalating cost of living. Your timing of retirement is also a factor. Retirement amount should be determined after one owns his own home.