Dude. Your kids are smarter than you. Seriously.
I experienced this a bit this weekend. I had the opportunity to pull out some games for my 12 year old son. Now, we're talking board games, but we're talking Descent, World of Warcraft (the board game), etc. Games that are pretty darn detail oriented when it comes to rules.
Now, I'd set up, pull out the rules, and read them out loud both for my benefit and for him. Normally, at a game night, I wouldn't do this. But I've found that when he hears the rules, he REMEMBERS them better than I do, after just once through. Holy crap! There were a couple times he'd recite a rule back to me that I didn't even remember reading, and I'd be floored.
So, yeah, don't worry about the rule set. Just find what works for YOU, and one you can remember, otherwise you'll feel like an idiot when your kids recite back to you things you said but forgot. And my opinion, if they wanna try D&D, do D&D 4e. It is so freakin' simple compared to passed editions.
And dude, you're older than me, so it's gotta be worse, right.
