My story mainly takes place in the present, however, it begins and ends about 20 years into the future. (The main character is reflecting on events in their youth.) Given that this is not science fiction, how "futuristic" should these beginning and ending scenes be? Also, as the main character narrates the story, should they refer to present day technologies as if they're antiquated, and should new technologies be mentioned? In other words, how can I show that twenty years have pastpassed?
*The only relevance of the future in my story is to show that the character has aged and to emphasize how important certain people/events were to them.