No matter the age, when a child has a serious and productive interest, do anything possible to feed it. Be the perfect enabler.
Drive anywhere. Fly anywhere. Rearrange schedules. Get or otherwise provide access to the supplies and props (and animals and vehicles and equipment and ...). Find the experts, communities, even mentors (eventually finding people who can provide real and credible feedback).
As importantly, protect the child from the trivial work inevitably and often mindlessly and reflexively foistered on him or her from others. A year absolutely dedicated to a single area of deep passion is better than the potpourri of a modern curricula.
Some care needs to be taken not to subvert the interest or overwhelm it. And admit your own humble status as not being an expert.
But childhood passion around a real interest is one of the most powerful forces. This is what eventually shapes industries and nations.