I took my oldest granddaughter out in the MGB today for the first time and she really enjoyed the experience. She chattered and waved at everyone we passed - it was her own one car parade.
My oldest grandson Will got his first ride at about the same age. I've got two grandchildren that aren't old enough to legally ride yet (car seat laws, rear facing, etc.) but I intend to give them an initiation as soon as it becomes possible.