I used to have a picture of my older son when he was 4 years old, he watched me taking a trans pan off and loved the speed wrench (looks and works like a hand drill) and he wanted to try it....
Then I had another picture of him helping my brother and I build a Hemi for dad's Roadrunner convert.... I posted it at work with the caption, "Building his first Hemi at 4 years old"...