[Craiggybear]

So I'm going to live till I'm at least 68 or possibly 80 ... too loose and broad a set of generalisations.

Anyone today in the west can be pretty sure of living to at least 68 (barring accidents) and possibly as much as 80 if you don't have heart disease and clogged arteries or are not morbidly obese. I've seen recent data suggest that people who are slightly overweight and are still comfortable (i.e. they are not restricted by it) actually seem to live longer on average.

I could have guessed this much myself.