The retirement age is not mandatory correct? If we at age 55 want to retire cannot? Don't think so. Just the SA,OA monies need to form the minimum sum to form RA to be later taken out at age 65 month by month? If after RA is funded any extra SA, OA you can take out. So when young before age 55 try to build up so you can retire early. Assume you have kids already earn their own monies or you are single. I think for me I will retire at age 55. Those want to work until age 63 can carry on.
Ok guys, I didn't expect the comment to be taken so seriously. But anyways, there are reasons why people are divided on this matter. Especially people who were earlier unprepared for the changes in some of these policies.
In a nutshell, SA isn't liquid as compared to many other forms of investment. Nonetheless, for it's form, it is rightly designed in this way because it is meant for retirement.
I do top-up my SA annually for that reason - 4% regardless of market conditions, that's pretty solid.
But of course, it isn't completely risk-free either. There could be changes in CPF policies too (Or if someday, a complete change of government). Although I don't see it happening in my lifetime, I wouldn't exclude it completely either.
Ultimately, it depends on the investment horizon and appetite for risk.