Years ago, my daughter, by the age of 13, had over 100 unlogged hours flying the plane, including some IMC. I didn't have an autopilot at the time, but she was quite good holding at an altitude and heading, once for 3 hours straight (in VMC). I never took my eyes off the panel for more than a few seconds, and occasionally gave a small assist with the trim wheel or rudder, but her help made it easier to fold maps, take bearings (no GPS yet), figure out new clearances, or just rest my arms. She was also solid for preflighting the plane, spotting traffic, etc, and even once reminded me about a missed radio call.
Kids in flying families who are engaged with the activity grow up to the trade, like a kid on a farm or in a family with a fishing boat. University and moves to other cities got in the way of her pursuing a PPL after she was 17, but she's still interested when her own family finances permit, and she'll inherit C-FBJO if I still own it when I close my logbook for the last time.