Lower the singles age to 30 years old is one thing. The other
thing is, it takes an ordinary couple who don't earn lots of money,
20~30 years to finish paying off their loans for a cheaper direct
HDB flat. 
Singles will need to take a even longer time to & need more
money to pay off the same amount of loan, is like 1 person paying
for 2. On top of that, singles are not allow to buy subdised HDB
direct, but from the resales market, which is even more expensive.
Besides, it's an old flat. 
Also, singles has to take loan from banks, and deprived from more
affordable HDB loans ! ! 
Singles are also paying taxes, but where are we treated like a
second class citizen in our own country ? ? 