My DC are 22 mos apart. Even though DD(now 5) didn't quite get the entire game at 3, she did (and still does) enjoy Uno. We did have to adapt some of the rules though - like if she had a blue card but didn't want to put it down, she could pick up a card from the deck, etc. DS(7 on Saturday) has been playing Uno since he was 3 as well. Of course, he was strategizing before he could even hold all the cards in his hand at one time!