I parleyed my curiosity in hardware into my first job. (My car-fixing skills alas didn't take me anywhere.) Hardware was fun for the first 10 years of my career, but now, well, it's just not interesting.
I played with Linux as well along the way, but I confess that too has dulled. Building your first machine is fun, building your 10th is less so.
The past couple years I've gone down the solar energy rabbit hole, and I'd love a wind turbine (but I just can't make the economic argument for having one.) If I do end up getting one, it'll be to prove to myself that it was a dumb idea all along.
In some ways we never stop tinkering. But the focus moves on to the next challenge.