Personally I was genetically programmed / crazy , Mom said I was pointing at cars before I could walk , always obsessed with them & anything motorized , I started with matchbox , Dinky , Corgi at about 2yo etc moved into hotwheels when they came out in 68 , started building model kits at 8 or so got into slot cars around 11 yo & by the time I could afford a R/C car I bought a real car at 15 & started working on it so it would be good to go when I got my drivers licence & have since spent my life building a racing cars .