We introduced our kids (now 13, 10, and 7) to Trouble pretty soon after they were able to count.  It's a very simple game to learn, yet fun even for the youngest.  Game play proceeds in turns, with a roll of 6 on a single die required to move a piece out of the "base".  The object is to get all four pieces around the board and safely to "home".  If a player lands on an opponent's piece, it has to go back to the base.  That's it.  Given the bells and whistles on newer games, I don't think Trouble will stay your child's favorite forever.  However, it brings enough fun to the table that they might break it out and play on a rainy day years down the road.