"Mid thirties" is absolutely not a common definition of mid life. For reference, Wikipedia defines "middle age" as being the age range from 40 to 64, based on citing nine different sources: https://en.wikipedia.org/wiki/Middle_age
And also why do you believe the life expectancy for HN users (mostly adults, large portion based in US) is only 72?!
Sure and there you have the problem. No wonder people who do not take mid life literally and plan as if half of it is over with 36 (or let it be 40 if you must) are in crisis with 50. "Midlife" is really just an euphemism for "old, but in denial".
And also why do you believe the life expectancy for HN users (mostly adults, large portion based in US) is only 72?!