I bought this set of puzzles for my eldest daughter's third birthday. She loves them. She could do the 12 piece one pretty much straight away with minimal help, but has needed to work up to the two with more pieces. Now though she can do all except the 24 piece one without help. She is still only 3 years 4 months though, so I'm not sure it will present a challenge for that much longer, but I think she will enjoy doing them for at least a couple more years just because she loves Disney princesses. There is quite a lot going on in the pictures, so I think that keeps them interesting. It's also fairly rare to find one with Tiana in, so that's another plus point.
Arrived very quickly and my granddaughter (being a Princess fan) thoroughly enjoyed putting these puzzles together. Nice to have smaller sizes. Big puzzles are sometimes too much and little ones lose interest!