DS is 4.5 and loving his marble run at the moment. He enjoys problem solving (maths sums and more practically e.g. building obstacle courses). I'm wondering about Gravitrax for Christmas. What age is it pitched at and how long does it last before they outgrow it? I also have a 7yo, so not too worried if it is a bit fiddly for him as she/we could help, but don't want it to be played with briefly and then forgotten about.
Also any recommendations of how to do it? Buy a starter set and a few add ons? I like the look of the zip wire for instance. I could get relatives to buy the add ons. Any alternatives people would recommend?