To each their own, you can only control what you say, not how it's interpreted.
Plus I really think people should be able to mature, just because you said something really mean when you were 19, doesn't mean at 39 you're a horrible person. In fact just because you said something really mean at 19, doesn't mean you're a horrible person at 19. But instead of it being a one-off comment at a party, it's now a part of you. I really think this is why so many young adults get so stressed out over social media, you constantly need to create this artificial image of some superhuman who's living a fantastic amazing life. Any misstep you'll lose fans,followers, etc. This makes so many people so miserable.
I know I became much happier after I got rid of my social media, but again to each their own.
As we get more comfortable with the idea that people have decades long fully public histories of inconsequential things, we will also get more comfortable with the idea that a person at 19 is different from the same person at 39.
Rereading my blog entries from 15 years ago, I wouldn't write the same things today, but if someone points at a 2006 blog entry to say something about 2021 me I also expect people won't take them especially seriously.
I think you may be overestimating how much people will care about the time difference. Simply put, it's extra additional context that will almost assuredly have to be put forward as a defense by you, after they have already formed their impression of you.
I suspect such claims will come off as very hollow to most people who have become upset with you. You would probably be questioned about why you had not proactively removed and apologized for your old writings on your own, as soon as you "changed your mind" about the topic. This of course ignores that changes are often slow, and rather unlikely to prompt you to recall every single trace you may have left of your previous thoughts. But that's all squishy context that the internet has thoroughly shown it does not care for, nor even recognize most of the time.
I've been writing publicly on the Internet for >15y, under my real name (www.jefftk.com), and no one has given me a hard time for old posts. Quite the contrary: people have often written to say they found my old posts useful or otherwise interesting.
I do think it might be different if my entire online presence consisted of a handful of posts written a long time ago, but anyone trying to get a sense of me from my writing can tell very quickly that I have a lot of views about a lot of different things.
Plus I really think people should be able to mature, just because you said something really mean when you were 19, doesn't mean at 39 you're a horrible person. In fact just because you said something really mean at 19, doesn't mean you're a horrible person at 19. But instead of it being a one-off comment at a party, it's now a part of you. I really think this is why so many young adults get so stressed out over social media, you constantly need to create this artificial image of some superhuman who's living a fantastic amazing life. Any misstep you'll lose fans,followers, etc. This makes so many people so miserable.
I know I became much happier after I got rid of my social media, but again to each their own.