Key points from article :
Office for National Statistics says life expectancy of most deprived males is 73.9 years.
Compared with 83.3 years among the least deprived in 2014 and 2016.
Gap has risen by nearly five months in the last three years.
For females, deprivation gap is 7.4 years.
Growth in inequality is a result of longevity gains among less deprived.
