things that happened during my lifetime, but it bothers me I don't remember are the fall of the Berlin wall and the Challenger explosion, I was around 5 and 2, respectively
I remember when we first got internet at home, good ol' dial-up, with the noise and the slowness and the forever it took to load an image, usually porn, back when porn was still big tittied blondes, about half still with pubic hair, crashing and freezing all the time. And then I've seen how the internet has evolved and become the beast that is today.
Same for phones.
I remember when tapes (video and audio) and computer disks were a necessity to keep out media, plus they'd take a ton of space, often requiring pieces of furniture or boxes or closets to organize. Now is all either on a cloud system, an external hard drive, a flash drive, or in one's computer (unbacked! how do you live with yourself you animal!). This change surprises me in that I am completely digital in all my media, save for about 20 books, and I'm so used to it now that I have a hard time imagining how dependent on those things I was. At one point I had well over 300 DVDs and CDs, plus 6ft bookshelves completely packed. And it bothers me to think all the moneys I spent on them, when I could've just waited a decade or so, and gotten it all for free XD