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It makes total sense. Lifespan is age-dependent. There is a minute possibility one can die at 45yo. But if they have not, of course, that portion of the bell curve is shifted out.

Yes, that’s how statistics work. They average all the people at 80 to see how long further they lived. And here they show the median.

Of course it makes sense. For people already older than the population median lifespan, do you expect their remaining lifespan to become negative? These are conditional probabilities, conditioned on the age already reached.

Your father is like you, except that you know he didn't get die before the age of 80. You might die a car crash at age 65. You father definitely didn't die in a car crash 15 years ago.