When my youngest 4 boys were under 8 years old, we starting doing puzzles in the cold winter months. We have kept up the tradition, and I think it is an excellent way for children 3 years old and up to keep busy for 20-30 minutes a day, when it's too cold to go outside!! We limit our puzzles to 550 pieces each to keep the frustration level down!!  =) Even visitors can't seem to stay away from the puzzle table that we keep in our dining room! Haha!