I am a 41 yo and I went down the slide. I don't recall seeing a height requirement on any signs. It might of said the depth where the slide comes out which is between 3-4 feet. Kids came down in life jackets and the life guards let some parents wait near the bottom to assist their kid. It's just dark inside for a bit. I wore my goggles sine I lie to see and I wear contacts. Most of the time I never went under when I came into the water. But sometimes I did. It just depended on if I was sitting or laying.