Explore commonly used personal finance terms.
Average life, or weighted average life, is a measure of the time until half of the principal of a loan or bond is expected to be repaid. This metric is used in fixed-income investments to assess repayment risk and interest rate exposure. A shorter average life implies faster principal repayment, which reduces credit risk and interest costs over time. Investors and analysts use average life to evaluate the risk and liquidity profile of debt securities, particularly for mortgage-backed and asset-backed securities.