They outgrow their cars the way kids outgrow clothes. This sounds ridiculous but it fucking happens.  During the first year of marriage my ex-wife sized up from her tiny 2 door coupe to a hatchback. She totaled that car and got an even bigger SUV. According to her most recent facebook post she just bought a gynormous truck (think Ford F450 XXXXL+ Farm Edition, for hauling trailers full of horses and shit). During this period of time she also piled on 150-200 lbs.