Soldering. Not quite in my 40s, but after getting into keyboards the last year I finally learned basic soldering skills. I've heard it referred to as "geek kni

Soldering. Not quite in my 40s, but after getting into keyboards the last year I finally learned basic soldering skills. I've heard it referred to as "geek knitting", and sitting in the garage for a few hours, carefully soldering together custom keyboards while listening to music is a great way to relax and focus. I just looked up some basic tutorials, got a few start kits from Amazon and just went with it. This has lead to other interests too, like learning more about electronics and low-level coding with micro-controllers. It also has the benefit that our kids now see me as someone who can fix anything. Most toys are simple enough to repair with basic tools and hearing the phrase "daddy can fix it" is worth it. Also there's a slight hope that seeing physical STEM skills (as opposed to daddy typing into a computer all day for work) makes an impression and it perks their interest in general engineering pursuits as they get older.