How old are stalactites?

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"I'm an electrician in a hospital that must be 1500 years old. Well, the stalactites that are growing in the plant room are 15" (37.5cm) long". Submitted by Rod Leffley, Bowenfels, Australia. (Ref. stalactites, time, dating)

Editorial Comment: The oldest permanent buildings in Australia were built in the 1790s.

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