At 18+ many people are of legal age in many countries. As such, they can legally start a business and profit by it irrespective of whether they are students or not.
Come to think of it, it is students who should be more worried about a secure financial future that anyone else. That is why SFI is very ideal for students who are keen to secure their financial future. Many students ideally want to start a business very early in their careers. SFI comes in very handy in that quest. That is because they can combine their studies very smoothly with SFI business without any setbacks in their studies. If you ask me, I believe any student not involved in SFI now is either ignorant about the business or is not sufficiently ambitious to build a private business and make money. If only they knew, the residual income potential SFI offers is enticing enough for students who want to make money early and retire early too to enjoy the rest of their lives in comfort.
Besides all that, it is students who now use all sorts of smart tools like smart phones, ipads, laptops and computers more than any other segmented groups. These are the tools together with the know-how to use them which everyone needs to succeed in SFI business. That places students in another vantage position to do well in SFI.