A few notes about your most recent dream, if you don't mind. Thinking about and writing about death is a time-honored tradition that extends from Woody Allen all the way back to the ancient Celts and Tibetans. It is an important milestone in one's life and there is nothing wrong with thinking or dreaming about it.
Balance is also important. If you find that you are thinking about death more often than you would like, perhaps so much that you are not enjoying other aspects of your life, it may be time to apply some intentionality. Think about whether there is something unresolved about your repeated returns to the topic, or whether you feel unprepared. Try to go deeper into the dreams and thoughts, rather than trying to escape from them or cover them over.
Many people, myself included, cling to previous stages of their lives too long and resist embracing new chapters. I get around this by thinking of myself as being in the teenaged years of the last third of my life. I get to be a mature woman, with all the advantages that come with it, and have another go at doing things for the first time. In thinking about my eventual death, I like to go out and turn my compost pile, where all the fruits and vegetables I have enjoyed are decaying and readying themselves to be fertilizer for the plants that are to grow in the future. I'll write more about this on my own blog, and turn back to reading about how you are looking at the stages of your life in your dreams and "woke" as they like to say.