average lifespan of the elite roman class?

[antisocialmunky]

Yes but our water is treated to kill almost all bacteria and other bad stuff in it. Their's isn't.

"Fair enough" about the rest. Average life span of emperors who died a natural death to Marcus Aurelius is 62.5 years, or an increase of about 5 years.
The fact that the list automatically exclude all deaths of the imperial family before the age of 39 remains unchanged (going by West level 3 female again, out the people who survive at age 15, just above a third would reach age 40).
Of these 11 emperors, 4 (36.4%) or 5 (45.4%) died of sickness and disease. Oh wow ouch. Looks to me medical ability and sanitation/hygiene actually increased to late empire. So much for decline.

EDIT: On another note, remaining life expectancy at age 40 is 21.1 years. So these 11 emperors on average only lived 1.4 years more than the average Jane (not Joe) who survived to age 40. Such are the fruits of imperial power

I'm not sure how you're getting better hygene out of those statistics...

As to emperors, how much of the adult population(in this case 15) reaches the age of 40? 1/3rd? So if you look at the emperors as a special group that survived to adulthood, 1/2 the emperors reaching the age of 40 is better than the general population of 1/3rd.

However, this is biased. Would be interesting to see that random people with the right genetics cna keep on trucking regardless.