I took 4 semesters of creative writing in highschool, because they fulfilled humanities elective requirements with minimal effort, and one of the assignments in all of them was letters to yourself 0... 5... five years intervals in the future. The teacher of those classes has consistently figured out my address where whoever the fuck plans class reunions and alumni associations fail, so I'm still getting regular letters from myself in the past. Contra all the essays you read from people who did something similar say, I've been more or less who teenage-me wanted me to be every letter I've gotten. This year, when I got sucked into the corporate world against my will, has been the only year I've been in a position me-of-the-past would disapprove of, but after a year of fighting the suits at every opportunity I've returned to where I started the year, hacking on what I think I can do the most good on with negligible input from parties not primarily interested in success and well-being my users. Whether that counts as success, teenage-me being unambitious or grownup me having stopped evolving at 16 I decline to think about.