Have you all seen this video which the producer edited to look like he was talking to his 12-year-old self? Brilliant! (Contains mild profanity.)
I definitely wouldn’t want to see my twenty-years-in-the-future self. However, if I could somehow use the wisdom of my years to give the younger me advice, I could avoid a lot of mistakes. But wait! If I hadn’t made those mistakes I wouldn’t have gleaned the wisdom in the first place… Time Travel is always mind-boggling on some level.