system
A chat on subreddit /r/pcmasterrace
human
She just turned 8.  Honestly, the only parts she had difficulty with were more strength-related, like inserting the RAM and thumb-screws.  Her small hands were extremely useful for getting into small spaces on the motherboard, however.
gpt
Came here to ask this question. I built computers with my son, but he was 14 at the time (2002 way more simple). I’m wanting to get my grandson ( my daughter’s son) into it. He just turned 8.