You probably have built very solid concepts/ideas about what types are in the program and how to name things, so that they make sense, and all other things that lead to a program being useful and easy to read, over the course of those 15 years. The situation might not be the same for more junior devs.

But also Elixir's paradigm is not the same as lets say some PHP slinging or JS. It encourages a stricter functional style, that already makes for better code than what many people produce in languages like JS and PHP, or Python.