In 1970s, where a 3 rooms flat cost about $16,000. Those uncles bought it and never sell it when they reached 55 years old about year 2000 and withdrew CPF about $400,000 as retirement sums. That not including their cash savings in the banks.
In fact those uncles staying in the 3 rooms flats are the most cash rich people.
In life never look down on people staying in the 3 room flats because they can be much more cash rich than you.