Why have philosophers and writers always worried about the meaning of life?

I think, because there is no definite answer to this question. For everyone, the meaning of life is different. All creative people expressed their thoughts on this matter, because for them it was an inexhaustible source of inspiration.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.