17.9 years seems like a long time. Is this only major two-vehicle collisions?
One year during a bad ice storm and stuck with a rental with no 4WD, I went into the ditch twice in one weekend. That's like half my lifetime allowance before I'm considered a bad driver, I guess.
Well since this is what the insurance industry uses, presumably "accidents" causing no damage (or minor damage not turned in to insurance) don't count.