I see what you're trying to say, and I agree with you and Croc. I did push my personal opinion on this, which I shouldn't have done after all. Alright, if we were to restate it this way, that "a family is an union of n people of the age of consent or higher, (where n belongs in [1; infinity), each of which is willingly and knowingly part of it", would it be closer to what it should be? =))
As for your example, I think what's causing so many talks in the media is that,
1. The girl is underage.
2. A lot of people would doubt it's her good will to marry that guy, unless she specifically likes old men.
3. Although it might be completely legal by the local law, many just find it so unusual (even realizing it might be legal), that they can't help discussing it everywhere.