I've already got my 9 year old driving (he sits on my lap me keeping my foot near the brake) in car parks and when we move our cars around to get out of the driveway.
He helps me with jobs on the bike (including doing almost everything under instruction on my RSV clutch change)
One of my main aims with him is to instill into him, you have to work to get anything, including getting a driving licence (or drivers license 😀).
(I also want him to be at least mildly mechanicly competent)