How Steve would want to conduct such a Course is obviously up to him, however the point seems to be getting made that a 5-6yo will be different to 6-8yo, will be different to 10-12yo, will be different to 14-16yo and on it goes.....the leg bones connected to tha kneebone etc.
Trying to run a specific Course for a 2-3 year age range may then start to really limit the numbers of people that would attend and make it not viable.
As an option, perhaps this Kids Course could be for adults? Let's call it a "Train the Trainer for a Kid's Financial Education".
Steve could go over options for 6yo through to 20yo.....he's got 2yo through to a 20yo so he's certainly been there done that.
Start off the Course with what he's found is good for the really young, others can throw in their experiences if they want, Steve could discuss good techniques for the 12yo and others could again throw in their experiences again etc etc.
Do you have kids now? Doesn't matter. The Course may still be useful to you one day. Are you a Grandparent that can't bring your Grandchild on the day but would like some ideas to apply. Great. If you're a parent with kids aged 2-12 this format would still work. Hey....you might be a brother or sister who would like some hints on ways you could help your siblings.
This format may resolve the problem of trying to target a Course at such a potentially wide age range of kids?
In summary, you as the adult learn some new ideas and apply them to your own individual circumstances if and when you're ready.
Just another idea.............