Some random teenager or other Darwin Award seeker would be the wildest stroke of luck for it to work for even a few seconds.
It all depends on the driver's skill. Age has nothing to do with it. Me girlfriends can do it. I believe her record is slightly over one minute. And that's with no formal stunt training.
They never really seem to be going fast enough to jump the 3 or four car-lengths they'd have to travel, then the car's frame isn't built to come crashing down on the nose like they do in films and drive away.
I once attempted this with a stock 1996 Volvo 940. The rims were deformed, all four shocks went through their mounts and through the hood, the springs shattered and the entire front end was twisted upwards during the landing. Although to the engineers credit, the car was still
somewhat drivable. Forwards, backwards and slight turns and up on the trailer. To this day, the engine is still powering a Super Seven kit car.
The car was stock aside from a quickly installed roll cage, seat from a WRC car, six point seat belts, and remotely activated fire suppression system. Mechanically it was not modified. We never mresured how long the "flight" was, but the height was approx 8 meters.
As for the two wheel driving. They cars are modified. I know this for a fact since I've done it meself. Special rims are used, with tires that have thicker sides. The car is also stripped of everything unnecessary and often balanced with weights. The frame/chassi is also strengthened.
Finally,
huh, the credit car trick. I've never tried it since i usually just pick the lo.. Uhm, use the keys.