They must be running out of anything newsworthy. Actually some grannies look a heck of lot better then many of those multifold pierced and heavily tattooed young chicks running around. There is nothing more disgusting then pierced lips and pierced tongues!
There must be a reason ... money, I doubt it. As csgal said - just wait a few years. Maybe a bastardised Oedipus complex? Kill grandfather marry grandmother? Maybe the ultimate rebellion from his parents/her kids (but waaaay too far)? Could it have been unknown?