We can learn a lot from children. Spontaneity, authenticity, imagination, curiosity, wonder. The lack of experiences helps them push out limit of supposed-to-be things and go wild with creativity.
Don’t lose that. Or if we have lost it along the way, learn how to be like that again.
One more thing about playing with children is that they are unpredictable. We as grown-ups (well, at least physically) tend to behave in predictable ways to avoid awkward situations. That’s why playing with children can be difficult & draining, or satisfying if we just go with the flow.