We gifted this puzzle to my son for his 5th birthday. He had mastered easier puzzles with around 40 pieces and needed a challenge. This solar system puzzle has given him just that. He needs a bit of help to get it all completed at this point, but I know that with a bit more practice, he'll get to the point where he can put it together himself. He's very interested in space right now, so the facts on the puzzle are a bonus.