18 years old trade shares , singapore

I do not understand why they are promoting that 18 years old can now trade in share. Most 18 years old will be doing national service or still studying. Have we set our priority right ?
After finishing study, most likely you still do not have a cents in pocket, maybe you already in debt , as you have to start paying back your parent or the banks for the study loans. where do you get the money to play shares?, after working few years to clear you study loans, you need to save up some cash for the rainny days, then you think of getting some insurance ,think of getting married, think of getting your HBD flats, think of bring up you child. if you can managed all this and still have cash to spare, go investing on what ever you like, but I am sure you will be
18 ++++++. Not 18