The answers given so far to the question, I believe, deliver an answer that is quite clear : the answer can only be subjective. Asking one person what is the meaning of life will always result in a personal answer. The reason is because the meaning we attribute to our living is always linked to our most important value. If you were to ask me, I would answer that each individual should lead his life in order to contribute to the development of humanity. I believe that heritage is the best way to leave your mark and to give meaning to your existence. That is my personal opinion.