You seem to be avoiding answering the question "what is the average life expectancy in the ULEZ and how is it expected to change"
I don't think I can put it more simply than that. would you agree with this Guardian article which says six months.
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London's ultra-low emission zone: good or bad idea?
Campaigners say it will cut pollution, but opponents claim it will hit poor people hardestwww.theguardian.com
Reading around the subject a bit, it appears that 6 months is an addition to the average life expectancy of children born now.
As air quality doesn't impact everyone equally, then I suspect that if you happened to be someone who suffered when there's poor air quality then you're individual life expectancy could be improved quite significantly.
However, even if air quality doesn't impact you, there's a good chance it would impact someone you know. Whilst that's not such a big a deal of its someone you are on speaking terms, it could well be someone who is very close to you which would be much harder.
That could be a spouse, child, grandchild, business partner, boss, nephew, niece, God child, best friend, friend with benefits, or many other people with whom you have a close friendship with.