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How many major volcanic eruptions have occurred in your lifetime?

Answer: dozens

A new online app produced by BBC Earth allows users to enter their date of birth, sex and height, and hear about how the world has changed since they joined it.

A 30-year-old male, for instance, has had his heart beat 1 billion times, been around for 146 major volcanic erputions, lived the equivalent of 17,214 generations of a house fly, lived through 68 solar eclipses, watched as the amount of available tea and number of endangered species increased, along with many more metrics derived from government agencies, environmental groups and wildlife groups.