"I like probably many people on this forum had unusually low sex drive for several years, and kept getting told my T was "normal" consistently testing in the 320-330 range. i finally did research and discovered that is not at all normal for someone in their 30s who is otherwise very healthy and who lifts heavy weights 3-4x/week. so i went to an endo and got complete tests w/pituitary MRI done and he agreed my T was low. he asked what treatment options i was interested in, and i said HCG looked interesting to me because i still wanted to have children. he said there is also low dose Clomid to consider. when i went back for results he said i had "abnormally normal" LH levels, in other words that i should have a natural pituitary response to produce more LH given my testosterone levels and that was not occurring. otherwise my system was functioning fine. he even diagnosed me with HH as a result. (i also have a weak but not nonexistent sense of smell, and my belief is that i have a milder form of Kallmann Syndrome, as although i went through puberty on time, i never grew much bodily hair and was a very scrawny kid until i hit the weights hard in my 20s. i think it doesn't get called Kallmann by the medical profession because it is rare and doesn't get diagnosed since puberty occurs)". 
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Overall, about 70% of the variation around average life expectancy [just over 80 for women and just over 75 for men in the .] is probably attributable to environmental factors your behaviors and your exposures. Probably only 30% is due to genetics. And that's very, very good news. There's so much we can do. Most of us should be able to get into our late 80s. What's more, to get to older ages, like the centenarians, you are necessarily compressing the time you're sick to the end of your life. It's not a case where the older you get, the sicker you get. It's very much the case that the older you get, the healthier you've been.