My son who is now 7 is currently playing through Neutopia II.  He loves it.  We usually have a couple of games on the go at any given time.  For the past several months we have been working on Neutopia II and Secret of Mana.  It takes us quite a while to get through games as we only play on Saturday nights, which have appropriately been named "Party night" 

.  We get snacks and game out for the evening.  When you restrict your playing time to one night a week, it's special.  He looks forward to it, and I am hoping these nights become fond memories for him. 
Secret of Mana has been especially fun because it's a co-op RPG.  My daughter often tags along as the third member of our party, but she's always a huge liability, so we disconnect her controller, while allowing her to still believe that she is playing.  I suspect she will become wise to our little trick very soon and we'll have no choice but to put up with her mindlessly wondering off on us, haha.