The nearest I found was the age of the limestone - 30million years - but that doesn't help! The caves are far younger. You'd have to determine the age of the orogeny that uplifted the rock to its present level, and the subsequent erosion regime that exposed it to karst development, for the maximum age for cave inception.
However, since they are still carrying a stream, they are still being formed!
Waitomo Caves Hotel was created in 1908.
Waitomo Glowworm Caves was created in 1889.
No. It is a place in New Zealand with caves, but it is not a country.
glowworms
Waitomo Caves, noted for their colonies of glow-worms.
Waitomo Caves in New Zealand attract around 500,000 visitors each year.
"Waitomo" in Maori means "water passing through a hole" or "water that flows into a cave" in reference to the underground rivers and caves in the Waitomo region of New Zealand.
The Waitomo Caves system is over 250 kilometers in length and around 120 meters deep. The main cave, known as the Glowworm Cave, is approximately 1.6 kilometers long.
Natural. Its a karst environment.
Waitomo Caves near Hamilton my friend
From god. +++ The question is "how", not "by whom"! They are still active, carrying a stream, so are still-developing karst caves in limestone, i.e. formed by dissolution of their host limestone by weakly-acidic water.
Waitomo.