Longevity genes appear to slow down the aging process by making cells and tissues more stress-resistant, better able to withstand the inevitable environmental insults that accumulate over a lifetime from bad diet, inflammation, radiation, genetic mutations and toxic chemical by-products called free radicals.

FORBES: Researchers are unlocking the mysteries of aging.

The overall risk of getting cancer in anyone's lifetime is 40% and some experts feel that 100 mSv of medical radiation can increase this by 1%.

WSJ: New Tracking of a Patient's Radiation Exposure

For girls exposed to radiation from the accident as infants, the report found a 4% increase above the lifetime expected risk of solid tumours and a 6% increase above that expected for breast cancer.

BBC: Fukushima: 'Small increased cancer risk'