mickeyd
Give me a museum and I'll fill it. (Picasso) Give me a forum ...
Professor Austad talks about life expectancy in this interesting article, but I thought that the following clip gave a good insight as to exactly what "life expectancy" really means. It was news to me...
“Life expectancy” sounds like it should refer to the expectation of future life, but it does not. It refers to the past. Life expectancy — shorthand for life expectancy at birth — is the average age at which people in 2008 died. Maybe we should call it death expectancy. Whatever we call it, it is a very precise number that tells us quite a bit about our present state of health. By tracking its change over time, we can see how health has changed historically.
We could calculate life expectancy for children born in 2008, but we would have to wait until all the children born in that year died. Don't hold your breath until that number is available. On the other hand, the Social Security Administration, having a vested interest in these matters, has already forecast (their word) or guessed wildly (my words) that a child born in 2008 can expect to live 82.7 years. Most demographers of future longevity feel this estimate is woefully low. Some, in fact, predict that children born in 2008 can expect to live more than 100 years.