The range of gravity extends infinitely, but the further away it gets the faster the force reduces eventually becoming negligible. The equation is essentially a fraction. Distance is the denominator so as it grows the force continuously sinks, but will never truly reach zero because there will always be a numerator so long as the objects exist and have mass.
I know that might not be a 5yo explanation but it’s the best I could do
Edit: Added the last three words of the first sentence
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