Hello,

In 2012 level 2 Sample Exam version 2, Q19 to Q24 relate to Fixed Income.

In Katharina Richter Case Scenario, "The pool has a weighted-average coupon (WAC) of 4.80% and a weighted-average maturity (WAM) of 243 months, which implies 17 months of seasoning, Richter reviews current prepayment estimates for this pool from three different providers."

我想问“17 months of seasoning" 是什么意思？

Thank you in advance!