ecfad6ad_Administration_Guide__Description
[Property Name] ReplaceAged [Default Value] True [Description] 
When ReplaceAged is enabled, any instances in the pool that expire due to reaching their MaxAge will be replaced immediately so that the pool will remain at its current size. Replacement is done in a background queue so that incoming threads will not have to wait for instance creation. The aim of his option is to prevent user requests from paying the instance creation cost as MaxAge is enforced, potentially while under heavy load at peak hours. Instances from the minimum side of the pool are always replaced when they reach their MaxAge, this setting dictates the treatment of non-minimum instances.
Administration Guide
Description