Low levels of Vitamin D may be associated with a longer life. Previous studies have shown low levels of Vitamin D to be associated with increased rates of illness and death.

However it's not known whether low levels of Vitamin D cause these diseases, so Dutch researchers looked at data from nearly 400 families where two siblings were over 90 years old.

Vitamin D levels were measured at different times of the year. They found people with at least one sibling over 90 had lower levels of Vitamin D than those with no siblings over 90.