# Weighted average life

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## Weighted Average Life

The amount of time for the principal on a loan or a mortgage to be paid off. The length of the weighted average life depends on the amount of principal paydowns and how often they are made. Once the WAL is calculated, one can determine how long it will take to pay off half of the remaining principal.
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The average life expectancy of a Martian after the age of maturity is about three hundred years, but would be nearer the one-thousand mark were it not for the various means leading to violent death.
Once, after ten years had passed, Ernest made a calculation from figures furnished by the chiefs of the Fighting Groups, and his conclusion was that the average life of a man or woman after becoming a member was five years.
Well, gentlemen, I don't know if you are aware that the average life of an elephant hunter from the time he takes to the trade is between four and five years.
How much do the doctors say we've added to the average life of man?
London, July 27 ( ANI ): After Japan was struck by a devastating tsunami-cum-earthquake last year, the average life expectancy of the country's women has taken a hit, removing them from the global longevity chart for the first time in 26 years.
According to The Guardian, the average life expectancy among Japanese men fell slightly to 79.
Over the past 150 years, the average life span--and correspondingly, the maximum life span--has been steadily increasing, Wilmoth says.
So, Perls and other researchers have compared siblings of centenarians with siblings of people born in the same years as the centenarians but who died at 73, the average life expectancy for people born in the late 1800s.
An additional crucial element to understanding the workings of the MBS market is the knowledge that because mortgages are prepayable at par before maturity, the average life of a mortgage pass-through is always far shorter than its stated final maturity.
The relative attractiveness of the yield and return can be judged in relation to a Treasury security of a comparable average life.
For example, at the start of 1993, newly issued 30-year GNMA 8s were expected to prepay at a speed of around 130 percent PSA with an expected average life of a little more than 10 years.
But the dramatic decline in mortgage rates during the year doubled the prepayment speed for those newly issued 30-year GNMA 8s and shortened their expected average life to around five years.

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