I'm nearly 40 and I also really liked the design.

From usability: It was clean, to the point, and I felt like the goal was to give me information so I could quickly find stuff I was interested in. no sidebars, no popups, no obvious dark patterns, just content.

From Preference: I really like the cyberpunk color scheme with, as I'd describe, bubblegum, aesthetic. It is fun without being overwhelming.

I like most things that pick a theme, and run with it while executing it well. Doesn't honestly matter what that theme is imho.

Demo: Early 20's male who likes tech.

Other examples of sites I like:

   jwz (.) org (recommend typing this one into address bar, don't follow links from HN.
   https://xxiivv.com/
   http://100r.co/site/home.html
   https://tildeverse.org/ , and most pages linked to from 
   https://tildeverse.org/members/
   http://9front.org , especially the FQA:
   http://fqa.9front.org

I never really liked the flat design, weird colors and shapes design trends from two years ago. So I'm happy to see subtle animations and gradients again.