Given a person's age x, population's average life span u, predict how long person can live? e.g. Say x is 6 and u = 76 one would expect life span of 74. But when x is 90, for same u = 76, one would expect life span of 94.
Is there a mathematical formula that gives this. Assume normal distribution on population's life span. I'm not sure if standard deviation is needed, but if needed, you can assume it's also given.