Possible, if you're a miser and has no liability. The
system in SG is designed to make people work for most if not all of
their lives.
Investments carries a risk, the higher the risk the better the
returns and vice-versa. Unit trusts needs to be chosen
correctly to see good returns. Unless you'e talking about
government bonds, you have a possibility of defaults in corporate
bonds.
On top of that, you need to have a large amount of cash surplus
invested in the derivatives listed above to be able to retire
early. Otherwise, you'll still need to work your asses off
until retirement age.
I know suntec city bonds require 250k for a unit now, and if
keep for 5 years, total payout at maturity is guaranteed at a
minimum of 5.28% per annum, possibly more... That one should be
lower risk ba...
But even if I'm a miser, my current gf (likely to be future
wife) is not. 
Actually I beg to differ that for investments, the higher the
risk, the better the returns... If you know what you are doing, the
risk would definitely be much lower than someone who is investing
purely because of hearsay or by gut feeling... I'm still sponging
up more research and info on this area though...
But talk so much... Ultimately still need the first pot of gold
to do all these stuff... :(
