Well, I run a retro-computing web site (https://twostopbits.com/) based on the Hacker News Arc code (https://github.com/jgrahamc/twostopbits) and the site makes me neither feel young or old. And not even particularly nostalgic. I mostly remember things I had great fun with a long time ago and it's fun to read about them again. I do like the preservation part of retro computing and helping keep things working, but even that is partly just personal satisfaction of making something work (again). For example: https://blog.jgc.org/2023/12/restoration-of-ibm-thinkpad-701...