I reckon you asking if a salaried person can retire in Singapore.
I not too sure if I can retire at 55 in 21 years time. But this is what I have done so far.
Paid off my HDB 4 room flat which cost $125,000 at 28.
After 5 years, I have accumulated the current CPF minimum sum of $117,000. Transferred the lump sum into Special account leaving it to compound at 4% interest. The required minimum sum when I hit 55 in 2031, will be $249,000. Leaving it in the special account, the current $117,000 compounding at 4% will generate the $249,000 required.
For the next 21 years, what ever I accumulate in CPF, I will be should be able to withdraw it as cash when I am 55. (Unless the goal post is shifted again). I calculated it should be around $420k. ( I have been working in the same company for 11 years; assumptions: there is no increase in the current remuneration package)
If the HDB 4 room flat gets En Bloc when I am age 50-54, I will pledged it as half the minimum sum required, in order withdraw more cash out of the system.
So far, my colleague who is the same age as me, who inherited a HDB 4 room from his parents, also parked $117,000 in his special account leaving it to compound at 4% interest.
Inherit the HDB from your parents, that should give you a head start.
As he did not purchase a HDB flat, he calculated he can withdraw $550,000 from CPF when he hit 55 in 2031.