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.
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”.