The mention of a river reminds of me of those ol' words by Norman Maclean [1]: "Eventually, all things merge into one, and a river runs through it. The river was cut by the world’s great flood and runs over rocks from the basement of time. On some of the rocks are timeless raindrops. Under the rocks are the words, and some of the words are theirs. I am haunted by waters."
As an early twenty-something, who thinks often too much about life and death and the wildness of it all, I like to think I'm preparing for death by carrying around a memento mori coin [2]. It's a healthy reminder that puts things in a golden perspective.
[1]: https://www.youtube.com/watch?v=OsDnrFBpsBk [2]: https://prints.dailystoic.com/products/memento-mori