What factors contribute to job satisfaction?
.... you have answered this well, but;
How realistic is the expectation of job satisfaction for all workers?
... this part is not adequately answered.
Let's take your paragraph -
To commence with, job fulfillment consists of several factors that have been united together in a way that even elimination of one of them would result in the lack of job satisfaction. Money, for instance, is the first incentive issue for applying a job. In particular, as young people are at their very initiate steps of indepencey and improvement, they pay too much attention to the salary they earn. Furthermore, they need job security. This is a supportive issue that conducts employees to rely on their job for a long period until they get locked and loaded. Accordingly, adult employees will use their full potential capabilities in their job career.
... this tells that salary is the biggest concern for many people to be satisfied with their job. So now you need to discuss how realistic is the expectation of this factor for various workers. Although you say that young workers pay too much attention on this factor, you also need to discuss how realistic their expectations are.