People in Harrow are among the longest-living in London, according to figures from union GMB.
Only seven of the capital's 32 boroughs have a higher life expectancy than Harrovians.
Men are expected to live to 78.9 while women live longer to an average of 83.1 - more than both the London and UK averages.
Kensington and Chelsea men and women live the longest, reaching 83.2 years and 87.2 years respectively, while Glaswegians have the shortest life spans, at 70.5 years and 77 years.
The results were published as part of the GMB's campaign to get central government to introduce free healthy school meals across the board to end such disparity in life expectancy.
A spokesman for Harrow PCT said: "The correlation between wealth and life expectancy is there for everyone to see and what the PCT is certainly concerned with is making sure that wards within the borough that have a comparatively bad life expectancy are brought in line with the rest of the area.
"We certainly encourage healthy eating, particularly in schools, but with regard to this campaign it is something the education department has to look at."