The gap between the lifespans of rich and poor people in England and Wales is rising for the first time since the 1870s, research showes.
Everyone is living longer but rich people's lives are extending faster, the City University London study says.
Better life expectancy narrowed the gap in the early 20th Century but this trend reversed for men in the 1990s.
Author Prof Les Mayhew from Cass Business School said the difference was mainly due to "lifestyle choices".
Based on figures from the Human Mortality Database, researchers measured the differences in age between the youngest 10% of adult deaths and the oldest 5%.
From 1870 to 1939 the gap steadily closed, the report said.
"Everyone benefited from improvements in clean drinking water, better housing, higher incomes and better health," said Prof Mayhew.
After 1950 there were further rises in life expectancy - though inequalities in lifespan persisted rather than narrowing further.
But in the 1990s lifespan inequalities actually worsened, particularly for men, for the first time since the late 1870s, say the researchers.
The researchers attributed the widening disparity to poor lifestyle choices.
"Many of the big gains from public health improvements are in the past and personal choices are now much more important," the report says.
"Men in lower socio-economic groups are the most likely to make damaging lifestyle choices.
"They put themselves in harm's way on average more than women do - they smoke more, drink more and there are periods in their lives when they partake in riskier activities," say the authors.
The authors suggest lack of wealth is not directly responsible for the difference, but the poorest groups are more likely to suffer the cumulative effects of decades of poor lifestyle choices and income inequality - while wealthier, more educated people may find it easier to adopt healthier habits.
The authors say the negative health outcomes of smoking, excessive alcohol consumption, poor diet and lack of exercise "are disproportionately associated with the poorest in society".
A Department of Health spokeswoman said everybody should have the opportunity to have a long and healthy life.
"The number of workless households is at a record low and we know that economic security can provide the foundation for better physical and mental health.
"We have shown that we are willing to take tough action to protect the public's health."
The fight against inequality is a long and never ending one but don't stay silent please,