My son was driving when he was...I'm not even sure, probably not much more than 2-years old. He continued to do so for as long as he was small enough to sit on my lap.
I grew up without a father. I was determined he would not do the same, so when my wife wanted to leave, I sold my businesses and let her go -- but I kept the baby. I was blessed with the opportunity to spend his entire childhood with him and I have always told people that we grew up together.
Raising him has always been the greatest accomplishment of my life.