House of Cards stars one of the best Actors of all time, Kevin Spacey so lets put it this way.
You don't have to be interested in politics to watch it. Its more about corruption and Revenge. The show features some dark themes such as domestic abuse, rape, murder, terrorism countless other adult themes.
To Tell you the truth it shouldn't really matter what age your kids are as long they understand what is going on.
This TV Series is much watch for anyone wanting to study film and TV. I Personally watched it to understand Cinematography and great actor performances and how editing is used to portray danger and other forms of suspense.
Just watch it. Kevin spacey is just amazing. and Scary at times. Don't let his personal life get in the way of his performance. I Personally never judge an actor by their personal lives. If They can act they can act.