How old is 'too old' for a child to be naked at a splash park?

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Sitting here with the 4yo niece charge at a splash park... 6/7 year old girl running round starkers! I'm a bit shocked tbh.

Now I have been "caught short" before, but she's just been sent in the water in her knickers, because she can always just go commando on the way home.

I think anything around 3+ is too old tbh.

Too many weird people in this world, not naked at any age.

DS is 3 and he sometimes goes naked at the splash pad, but not uncommon here to see babies and young toddlers naked at the splash pad. Seems age 4 or 5 years old is when they start to wear bottoms imo.