That doesn't seem to be true, the global expectancy is 73 and only a dozen of the wealthiest countries are mid 80s. I wouldn't be worried about dying at 70, but maybe I'm built of tougher stuff.
You say my claim is not true then proceed to acknowledge it is true. To be clear about the fact: about 1/4 of all countries have a life expectancy >80, and as you said, more than a dozen in mid-80s.
Well, no, no country on earth has an expectancy in the mid 80s, I was being generous with your wording. 40-50 countries have expectancy between 80-84, which is early 80s. Most countries are sub-80.
My original statement was that life expectancy in many countries is in the mid-80s. Which is, in fact, true.
If you want to split hairs about what constitutes “mid”, you can, but I doubt many people would agree with you that age 84 does not qualify as “mid-eighties”.