If you do a google search, and you have your cholesterol and blood pressure readings, there are American life insurance websites that will calculate how long they think you'll live - and they've got loads of experience and the methodology is pretty robust.
Basically it all hinges on 1) low blood pressure, 2) not smoking, 3) no major hereditary problems (like cancer) and (surprisingly) loads of veg.
The big difference between me and another bloke was veg consumption, and it made a fearsome difference.
This wasn't the caluclator I used but it's similar
Worth looking at before you stick any extra dough into the pension. Seriously - knowledge is power. The offer they make you is based on the averages, and in the public sector if you have good reason to think you'll live longer then the odds favour you, not the "house".