My son just turned 10 years. I have had a real hard time getting him interested in watching football with me.  Since we live in San Francisco, and both the Niners and Raiders have pretty much sucked for a bunch of years, and I don't get that many Giants games, I haven't pressed it too much.  

Last year, he played baseball in Little league, and never got past "throwing like a girl" - But, at the end of the season, the team had a picnic, he picked up a football, and threw a perfect spiral.  

After I scraped my jaw off the floor, I started throwing the ball with him and had a blast.

But even so, usually when a football game is on, he has gone off to play on the computer, or generally do something else.  But today, for the first time, he sat down next to me and started asking me about the rules, and why I cheared at certain things and moaned or grumbled over others.

It was a lot of fun, and I am really looking forward to having a football watching buddy, even if he ultimately becomes a 9er or raider fan