DEFINITION of 'Weighted Average Loan Age  WALA'
A dollarweighted average measuring the age of the individual loans in a mortgage passthrough or pooled security, such as Ginnie Mae or a Freddie Mac security. The WALA is measured as the time in months since the origination of the loans, with the weighting based on each loan's size in proportion to the aggregate total of the pool.
INVESTOPEDIA EXPLAINS 'Weighted Average Loan Age  WALA'
The weighted average age will change over time as some mortgages get paid off faster than others. Based on the issuer of the mortgagebacked securities (MBS), the WALA may be weighted on the remaining principal balance dollar figure, or the beginning notional value of the loan.
The flip side of the WALA is the weighted average maturity (WAM), which is a dollarweighted measure of the months remaining until the principal amounts are completely repaid on each loan in the pool.

Pool Factor
The percentage of the original principal that is left to be distributed ... 
Fixed Income
A type of investing or budgeting style for which real return ... 
MortgageBacked Security (MBS)
A type of assetbacked security that is secured by a mortgage ... 
PassThrough Security
A pool of fixedincome securities backed by a package of assets. ... 
Weighted Average Maturity  WAM
The weighted average of the time until all maturities on mortgages ... 
Agency Swap Program
A form of securitization whereby singlefamily residential mortgages ...

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